Device, method, and program

ABSTRACT

[Object] To provide a mechanism capable of accommodating legacy terminals not supporting GFDM in addition to terminals supporting GFDM when GFDM is introduced. 
     [Solution] A device includes: a setting unit configured to variably set at least one of an interval between subcarriers and a time length of a subsymbol included in a unit resource constituted by one or more subcarriers or one or more subsymbols; and a transmission processing unit configured to perform filtering for every predetermined number of subcarriers.

TECHNICAL FIELD

The present disclosure relates to a device, a method, and a program.

BACKGROUND ART

In recent years, as a representative of multicarrier modulationtechniques (that is, multiplexing techniques or multiple accesstechnologies), orthogonal frequency division multiplexing (OFDM) andorthogonal frequency division multiple access (OFDMA) have been put topractical use in various wireless systems. Application examples includedigital broadcasting, a wireless LAN, and a cellular system. OFDM hasresistance with respect to a multipath propagation path and can preventthe occurrence of inter-symbol interference caused by a multipath delaywave by employing a cyclic prefix (CP). On the other hand, OFDM has adisadvantage in that a level of out-of-band radiation is large. Further,a peak-to-average power ratio (PAPR) tends to increase, and there isalso a disadvantage in which it is vulnerable to distortion occurring intransmission and reception devices.

SC-FDE, in which single-carrier (SC) modulation and frequency domainequalization (FDE) are combined, is used as a method of reducing thePAPR which is a disadvantage of OFDM and providing resistance to themultipath propagation path.

Besides, new modulation techniques capable of suppressing theout-of-band radiation which is a disadvantage of OFDM have beendeveloped. The present modulation technique aims to suppress theout-of-band radiation by applying a pulse shape filter to symbols thathave undergone serial-to-parallel (S/P) conversion in OFDM. The entireband, a predetermined number of subcarrier units (for example, resourceblock units in LTE), each subcarrier, or the like is considered as atarget of filtering. The present modulation technique can be calledvarious names such as universal filtered-OFDM (UF-OFDM), universalfiltered multi-carrier (UFMC), filter bank multi-carrier (FBMC),generalized OFDM (GOFDM), and generalized frequency divisionmultiplexing (GFDM). In this specification, the present modulationtechnique is referred to as a “GFDM,” but, of course, this term has nonarrow meaning. A basic technique related to GFDM is disclosed, forexample, in the following Patent Document 1 and Non-Patent Document 1.

CITATION LIST Patent Literature

-   Patent Literature 1: US Patent Publication No. 2010/0189132

Non-Patent Literature

-   Non-Patent Literature 1: N. Michailow, et al., “Generalized    Frequency Division Multiplexing for 5th Generation Cellular    Networks,” IEEE Trans. Commun., Vol. 62, no. 9, September 2014.

DISCLOSURE OF INVENTION Technical Problem

However, in a transition period in which GFDM is introduced, there maybe legacy terminals not supporting GFDM in addition to terminalssupporting GFDM. In this regard, it is desirable to provide a mechanismcapable of accommodating legacy terminals not supporting GFDM inaddition to terminals supporting GFDM when GFDM is introduced.

Solution to Problem

According to the present disclosure, there is provided a deviceincluding: a setting unit configured to variably set at least one of aninterval between subcarriers and a time length of a subsymbol includedin a unit resource constituted by one or more subcarriers or one or moresubsymbols; and a transmission processing unit configured to performfiltering for every predetermined number of subcarriers.

In addition, according to the present disclosure, there is provided amethod including: variably setting at least one of an interval betweensubcarriers and a time length of a subsymbol included in a unit resourceconstituted by one or more subcarriers or one or more subsymbols; andperforming, by a processor, filtering for every predetermined number ofsubcarriers.

In addition, according to the present disclosure, there is provided aprogram causing a computer to function as: a setting unit configured tovariably set at least one of an interval between subcarriers and a timelength of a subsymbol included in a unit resource constituted by one ormore subcarriers or one or more subsymbols; and a transmissionprocessing unit configured to perform filtering for every predeterminednumber of subcarriers.

Advantageous Effects of Invention

As described above, according to the present disclosure, a mechanismcapable of accommodate legacy terminals not supporting GFDM in additionto terminals supporting GFDM when GFDM is introduced is provided. Notethat the effects described above are not necessarily limitative. With orin the place of the above effects, there may be achieved any one of theeffects described in this specification or other effects that may begrasped from this specification.

Further, in this specification and the drawings, there are cases inwhich elements having substantially the same functional configurationare distinguished by adding different letters after the same referencenumeral. For example, a plurality of elements having substantially thesame functional configuration are distinguished as terminal devices200A, 200B, and 200C as necessary. However, when it is not necessary toparticularly distinguish a plurality of elements having substantiallythe same functional configuration, only the same reference numeral isattached. For example, when it is not necessary to particularlydistinguish terminal devices 200A, 200B and 200C, they are referred tosimply as a “terminal device 200.”

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an explanatory diagram for describing an example of aconfiguration of a transmission device supporting GFDM.

FIG. 2 is an explanatory diagram for describing an example of aconfiguration of a transmission device supporting OFDM.

FIG. 3 is an explanatory diagram for describing an example of aconfiguration of a transmission device supporting SC-FDE.

FIG. 4 is an explanatory diagram illustrating an example of a schematicconfiguration of a system according to an embodiment of the presentdisclosure;

FIG. 5 is a block diagram illustrating an example of a configuration ofa base station according to the embodiment.

FIG. 6 is a block diagram illustrating an example of a configuration ofa terminal device according to the embodiment.

FIG. 7 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 8 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 9 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 10 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 11 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 12 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 13 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 14 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 15 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 16 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 17 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 18 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 19 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 20 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 21 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 22 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 23 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 24 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 25 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 26 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 27 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 28 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 29 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 30 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 31 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 32 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 33 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 34 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 35 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 36 is an explanatory diagram for describing technical features of asystem according to the embodiment.

FIG. 37 is a block diagram illustrating a first example of a schematicconfiguration of an eNB.

FIG. 38 is a block diagram illustrating a second example of a schematicconfiguration of an eNB.

FIG. 39 is a block diagram illustrating an example of a schematicconfiguration of a smartphone.

FIG. 40 is a block diagram illustrating an example of a schematicconfiguration of a car navigation device.

MODE(S) FOR CARRYING OUT THE INVENTION

Hereinafter, (a) preferred embodiment(s) of the present disclosure willbe described in detail with reference to the appended drawings. In thisspecification and the appended drawings, structural elements that havesubstantially the same function and structure are denoted with the samereference numerals, and repeated explanation of these structuralelements is omitted.

Further, description will proceed in the following order.

1. Modulation schemes2. Schematic configuration of system3. Configuration of devices3.1. Configuration of base station3.2. Configuration of terminal device4. Technical features5. Application examples

6. Conclusion 1. Modulation Schemes

First, GFDM, OFDM, and SC-FDE will be described with reference to FIGS.1 to 3.

(GFDM)

FIG. 1 is an explanatory diagram for describing an example of aconfiguration of a transmission device supporting GFDM. Referring toFIG. 1, a bit sequence (for example, a transport block) from an upperlayer is processed, and a radio frequency (RF) signal is output. The bitsequence undergoes forward error correction (FEC) coding, rate matching,scrambling, interleaving, and mapping bit sequences to symbols (whichmay be a complex symbols or are also referred to as “signal points”)(bit-to-complex constellation mapping) and then undergoes modulation asillustrated in FIG. 1. Various constellations such as BPSK, QPSK, 8PSK,16QAM, 64QAM, 256QAM, or the like may be used for mapping the bitsequence to symbols. In the modulation, first, S/P conversion isperformed, resource element mapping, over-sampling, and pulse shapingare performed on each of a plurality of divided signals, and theplurality of divided signals are combined into one signal in a timedomain (that is, a time waveform) by frequency to time conversion (forexample, inverse discrete Fourier transform (IDFT) or inverse fastFourier transform (IFFT)) which is subsequently performed. After themodulation, cyclic prefix (CP) addition, analog processing, and RFprocessing are performed.

In GFDM, over-sampling is performed on symbols on a subcarrier in orderto perform filtering (that is, pulse shaping) in predetermined units.Then, filtering is performed on the symbols that have undergone theover-sampling. The frequency to time conversion will be performed onthese filtered symbols. In GFDM, it is possible to suppress theout-of-band radiation which is a disadvantage of OFDM through thefiltering. Further, in GFDM, even when it is combined withmultiple-input and multiple-output (MIMO) or the like, it is possible toenable a reception device side to perform all processes in a frequencydomain. However, since inter-symbol interference occurs for each elementdue to influence of filtering, an interference canceller is used on thereception device side. Regarding this point, in OFDM and SC-FDE,interference suppression is implemented by simple FDE.

As described above, GFDM has a problem in that the reception device iscomplicated in return for overcoming the disadvantage of the out-of-bandradiation. In devices in which low-cost low power consumptioncommunication is desirable such as machine type communication (MTC)devices and Internet of things (IoT) devices, this problem can be fatal.

(OFDM)

FIG. 2 is an explanatory diagram for describing an example of aconfiguration of a transmission device supporting OFDM. Referring toFIG. 2, a difference with the transmission device supporting GFDMdescribed with reference to FIG. 1 lies in a modulation portionsurrounded by a broken line. In description of this difference, first,S/P conversion is performed, and resource element mapping is performedfor each of a plurality of divided signals. As a result, symbols areallocated to a predetermined subcarrier. Then, frequency to timeconversion (for example, IDFT or IFFT) is performed on a predeterminednumber of subcarriers, so that the signals are combined into one signalin the time domain.

As described above, OFDM has resistance with respect to the multipathpropagation path, and can prevent the occurrence of inter-symbolinterference caused by the multipath delay wave. On the other hand, OFDMhas a disadvantage in that a level of out-of-band radiation is large.Further, the PAPR tends to increase, and there is also a disadvantage inwhich it is vulnerable to distortion occurring in transmission andreception devices.

(SC-FDE)

FIG. 3 is an explanatory diagram for describing an example of aconfiguration of a transmission device supporting SC-FDE. Referring toFIG. 3, a difference with the transmission device supporting GFDMdescribed with reference to FIG. 1 lies in a modulation portionsurrounded by a broken line. In description of this difference, first,time to frequency conversion (for example, discrete Fourier transform(DFT) or inverse fast Fourier transform (FFT)) is performed. Thereafter,resource element mapping is performed in the frequency domain, andcombination into one signal in the time domain is performed by frequencyto time conversion. Thereafter, since the CP is added, the receptiondevice can easily implement FDE.

As described above, SC-FDE can have resistance with respect to themultipath propagation path while reducing the PAPR. On the other hand,when it is combined with MIMO, SC-FDE has a disadvantage in that adecoding process on the reception device side is complicated (forexample, turbo equalization and repeated interference cancellation areperformed).

2. Schematic Configuration of System

Next, a schematic configuration of a system 1 according to an embodimentof the present disclosure will be described with reference to FIG. 4.FIG. 4 is an explanatory diagram illustrating an example of a schematicconfiguration of the system 1 according to an embodiment of the presentdisclosure. Referring to FIG. 4, the system 1 includes a base station100 and a terminal device 200. Here, the terminal device 200 is alsoreferred to as a “user.” The user may also be referred to as “userequipment (UE).” Here, the UE may be UE defined in LTE or LTE-A or maymean a communication device more generally.

(1) Base Station 100

The base station 100 is a base station of a cellular system (or a mobilecommunication system). The base station 100 performs radio communicationwith a terminal device (for example, the terminal device 200) locatedwithin a cell 10 of the base station 100. For example, the base station100 transmits a downlink signal to the terminal device and receives anuplink signal from the terminal device.

(2) Terminal Device 200

The terminal device 200 can perform communication in the cellular system(or the mobile communication system). The terminal device 200 performsradio communication with the base station of the cellular system (forexample, the base station 100). For example, the terminal device 200receives a downlink signal from the base station and transmits an uplinksignal to the base station.

(3) Multiplexing/Multiple Access

Particularly, in an embodiment of the present disclosure, the basestation 100 performs radio communication with a plurality of terminaldevices via orthogonal multiple access/non-orthogonal multiple access.More specifically, the base station 100 performs radio communicationwith a plurality of terminal devices 200 through multiplexing/multipleaccess using GFDM.

For example, the base station 100 performs radio communication with aplurality of terminal devices 200 by multiplexing/multiple access usingGFDM in the downlink. More specifically, for example, the base station100 multiplexes signals destined for a plurality of terminal devices 200using GFDM. In this case, for example, the terminal device 200 removesone or more other signals serving as interference from a multiplexedsignal including a desired signal (that is, a signal destined for theterminal device 200), and decodes the desired signal.

The base station 100 may perform radio communication with a plurality ofterminal devices by multiplexing/multiple access using GFDM in theuplink instead of the downlink or together with the downlink. In thiscase, the base station 100 may decode each of signals from themultiplexed signal including the signals transmitted from a plurality ofterminal devices.

(4) Supplement

The present technology can also be applied to multi-cell systems such asheterogeneous networks (HetNet) or small cell enhancement (SCE).Further, the present technology can also be applied to MTC devices andIoT devices.

3. Configuration of Devices

Next, configurations of the base station 100 and the terminal device 200according to the present disclosure will be described with reference toFIGS. 5 and 6.

3.1. Configuration of Base Station

First, an example of a configuration of the base station 100 accordingto an embodiment of the present disclosure will be described withreference to FIG. 5. FIG. 5 is a block diagram illustrating an exampleof a configuration of the base station 100 according to an embodiment ofthe present disclosure. Referring to FIG. 5, the base station 100includes an antenna unit 110, a radio communication unit 120, a networkcommunication unit 130, a storage unit 140, and a processing unit 150.

(1) Antenna Unit 110

The antenna unit 110 radiates signals outputted from the radiocommunication unit 120 into space as radio waves. Further, the antennaunit 110 converts radio waves in space into signals, and outputs thesignals to the radio communication unit 120.

(2) Radio Communication Unit 120

The radio communication unit 120 transmits and receives signals. Forexample, the radio communication unit 120 transmits a downlink signal tothe terminal device, and receives an uplink signal from the terminaldevice.

(3) Network Communication Unit 130

The network communication unit 130 transmits and receives information.For example, the network communication unit 130 transmits information toother nodes and receives information from the other nodes. Examples ofother nodes include other base stations and core network nodes.

(4) Storage Unit 140

The storage unit 140 temporarily or permanently stores programs andvarious types of data for an operation of the base station 100.

(5) Processing Unit 150

The processing unit 150 provides various functions of the base station100. The processing unit 150 includes a setting unit 151 and atransmission processing unit 153. Further, the processing unit 150 mayfurther include components other than these components. In other words,the processing unit 150 may also perform operations other than theoperations of these components.

Operations of the setting unit 151 and the transmission processing unit153 will be described below in detail.

3.2. Configuration of Terminal Device

First, an example of the configuration of the terminal device 200according to an embodiment of the present disclosure will be describedwith reference to FIG. 6. FIG. 6 is a block diagram illustrating anexample of a configuration of a terminal device 200 according to anembodiment of the present disclosure. Referring to FIG. 6, the terminaldevice 200 includes an antenna unit 210, a radio communication unit 220,a storage unit 230, and a processing unit 240.

(1) Antenna Unit 210

The antenna unit 210 radiates signals outputted from the radiocommunication unit 220 into space as radio waves. Further, the antennaunit 210 converts radio waves in space into signals, and outputs thesignals to the radio communication unit 220.

(2) Radio Communication Unit 220

The radio communication unit 220 transmits and receives signals. Forexample, the radio communication unit 220 receives a downlink signalfrom the base station and transmits an uplink signal to the basestation.

(3) Storage Unit 230

The storage unit 230 temporarily or permanently stores programs andvarious types of data for an operation of the terminal device 200.

(4) Processing Unit 240

The processing unit 240 provides various functions of the terminaldevice 200. The processing unit 240 includes a reception processing unit241. The processing unit 240 may further include components other thanthese components. In other words, the processing unit 240 may alsoperform operations other than the operations of these components.

An operation of the reception processing unit 241 will be describedbelow in detail.

4. Technical Features

Next, technical features of the system 1 will be described.Specifically, technical features of the transmission device and thereception device included in the system 1 will be described. In thefollowing description, under the assumption of the downlink, the basestation 100 will be described as the transmission device, and theterminal device 200 will be described as the reception device, and asimilar description applies to the uplink.

(1) Overview

FIG. 7 is an explanatory diagram for describing an example of aconfiguration of frequency resources and time resources in GFDMaccording to the present embodiment. Component carriers (CCs)illustrated in FIG. 7 are allocated to the system 1 according to thepresent embodiment. A bandwidth of the component carrier is indicated byB_(CC). Here, the component carrier may be a component carrier definedin LTE or LTE-A or may mean a unit frequency band more generally. In thecomponent carrier, frequency resources are further divided into blockshaving a predetermined bandwidth B_(RB) called N_(RB) resource blocks(RBs). In the case of implementing the multiple access, it is desirablethat frequency resources be allocated to the users in units of resourceblocks. The resource block is further divided into units calledsubcarriers.

Here, in general GFDM (or OFDM), a fixed value is set as intervals ofthe subcarriers (hereinafter, also referred to as “subcarrier intervals(subcarrier spacing)”) within a target system. For example, in OFDM ofLTE, 15 kHz is permanently set as the subcarrier interval. A subcarrierbandwidth may be regarded as the subcarrier interval. A detaileddefinition will be described in detail below.

In the present embodiment, this point is one of the features that enablethe transmission device (for example, the setting unit 151) to variablyset the subcarrier interval. Furthermore, in the present embodiment, asone of the features, as the subcarrier interval, a different value maybe set for each resource block in the component carrier, or furtherdifferent values may be set within the resource block. As a result, itis possible to set a subcarrier interval appropriate for a propagationpath state. Further, when communicating with a plurality of receptiondevices, the transmission device can set an appropriate subcarrierinterval in accordance with performance and a request of each receptiondevice. Therefore, the system 1 can accommodate various types ofreception devices.

Regarding resources in the time direction, there is a unit called asubframe as a unit serving as a reference. Here, the subframe may be asubframe defined in LTE or LTE-A or may mean a unit time more generally.Basically, it is desirable that a subframe length be fixedly set. Thesubframe is further divided into units called GFDM symbols. A CP isadded to each GFDM symbol. Basically, it is desirable that a GFDM symbollength be fixedly set. Then, the GFDM symbol is further divided intounits called subsymbols. A time length of the subsymbol (hereinafter,also referred to as a subsymbol length (a subsymbol period)) is fixedlyset in the general GFDM.

In the present embodiment, this point is one of the features that enablethe transmission device (for example, the setting unit 151) to variablyset the subsymbol length. Similarly to the case of the subcarrier, inthe present embodiment, as a subsymbol length, a different value may beset for each resource block, or further different values may be setwithin the resource block.

The following table shows a list of parameters related to frequencyresources and time resources of GFDM according to the presentembodiment. Hatched parts in the table indicate differences from thegeneral GFDM, which are one of the features of the GFDM related to thepresent embodiment.

Here, the transmission device (for example, the setting unit 151) canset the parameters so that compatibility with OFDM or SC-FDE is secured.For example, the transmission device can secure backward compatibilityby setting the subcarrier interval and the subsymbol length to be thesame as those in OFDM or to be the same as those in SC-FDE. Accordingly,the system 1 can accommodate the legacy terminals not supporting GFDM.

FIG. 8 illustrates an example of a flow of a process performed by thetransmission device that transmits a signal through such a resourceconfiguration. FIG. 8 is a flowchart illustrating an example of the flowof signal processing performed in the transmission device according tothe present embodiment.

As illustrated in FIG. 8, the transmission device (for example, thesetting unit 151) first variably sets at least one of the subcarrierinterval and the subsymbol length (step S102). Next, the transmissiondevice (for example setting unit 151) sets other parameters (step S104).Examples of other parameters include a filter coefficient, anover-sampling parameter, the number of subcarriers, the number ofsubsymbols, and the like. The setting of the parameters will bedescribed in detail below. Next, the transmission device (for example,the transmission processing unit 153 and the radio communication unit120) performs transmission signal processing on the basis of the abovesetting, and generates the RF signal (step S106). Examples of thetransmission signal processing to be performed include filtering,over-sampling, and the like. The transmission signal processing will bedescribed below in detail. Then, the transmission device (for example,the antenna unit 110) transmits the generated RF signal (step S108).Then, the process ends.

The transmission signal processing (corresponding to step S106) will befirst described below in detail, and then the parameter setting(corresponding to steps S102 and S104) will be described in detail.

(2) Transmission Signal Processing

The transmission signal processing when the subcarrier interval and thesubsymbol time length are variably set will be described. Here, thetransmission device refers to, for example, the radio communication unit120 that operates under the control of the transmission processing unit153. Further, here, the reception device refers to, for example, theradio communication unit 220 that operates under the control of thereception processing unit 241. Furthermore, here, the multi-cell systemsuch as HetNet or SCE is assumed.

In the following description, it should be noted that an indexcorresponding to a subframe is omitted unless otherwise stated. Further,indices i and u of a transmission device i and a reception device u mayindicate IDs of cells to which the devices belong or IDs of cellsmanaged by the devices.

A bit sequence to be transmitted from the transmission device i to thereception device u in a subframe t is indicated by b_(i,u). The bitsequence b_(i,u) may constitute one transport block. The followingdescription will proceed with an example in which the transmissiondevice i transmits one bit sequence to the reception device u, but thetransmission device i may transmit a plurality of bit sequences to thereception device u, and in this case, the bit sequence may constitute aplurality of transport blocks.

(2.1) First Example

FIGS. 9 to 11 are explanatory diagrams for describing an example of aconfiguration of a first transmission device supporting GFDM accordingto the present embodiment. First, the transmission device performsprocessing illustrated in FIG. 9 and then performs processingillustrated in FIG. 10 for each user. Thereafter, the transmissiondevice performs processing illustrated in FIG. 11 for each transmittingantenna port. FIGS. 9 to 11 illustrate an exemplary configuration when aGFDM signal is transmitted to one or more users through multipleantennas. In other words, the number of users (or the number ofreception devices) N_(U)≧1, and the number of transmitting antenna ports(or the number of transmitting antennas) N_(AP)≧1. In the drawings, thenumber of users is indicated by U, and the number of transmittingantenna ports is indicated by P.

In the first example, the transmission signal processing of OFDMillustrated in FIG. 2 is extended to implement transmission signalprocessing of GFDM. The transmission process will be described belowwith reference to FIGS. 9 to 11.

As illustrated in FIG. 9, first, the transmission device performs CRCcoding, FEC coding (for example, a convolutional code, a turbo code, anLDPC code, or the like), rate matching for adjusting a code rate, bitscrambling, bit interleaving, and the like. These processes areexpressed as follows.

[Math. 1]

b _(CRC,i,u) =CRC _(ENC)(b _(i,u) ,u,i,t)

b _(FEC,i,u) =FEC _(ENC)(b _(CRC,i,u) ,u,i,t)

b _(RM,i,u) =RM(b _(FEC,i,u) ,u,i,t)

b _(SCR,i,u) =SCR(b _(RM,i,u) ,u,i,t)

b _(INT,i,u)=π(b _(SCR,i,u) ,u,i,t)  (1)

In each process, a processing configuration may change for eachreception device u, each transmission device i, or each subframe t. InFormula (1), the process is regarded as a function, and a processingresult of a preceding stage is dealt as a parameter of a process at asubsequent stage.

Subsequently, as illustrated in FIG. 10, the transmission device maps(that is, converts) a bit sequence to a complex symbol after the abovebit processing, and further maps it to a spatial layer 1. Theseprocesses are expressed as follows.

$\begin{matrix}\lbrack {{Math}.\mspace{11mu} 2} \rbrack & \; \\{{s_{i,u} = \begin{bmatrix}s_{i,u,0} \\\vdots \\s_{i,u,{N_{{SL},i,u} - 1}}\end{bmatrix}}{s_{i,u,l} = \lbrack {s_{i,u,l,0}\mspace{14mu} \ldots \mspace{14mu} s_{i,u,l,{N - 1}}} \rbrack}} & (2)\end{matrix}$

Here, various constellations such as BPSK, QPSK, 8PSK, 16QAM, 64QAM, or256QAM can be used for mapping to the complex symbols. Further,N_(SL,i,u) indicates the number of spatial layers for the receptiondevice u.

After the mapping to the spatial layer, the transmission device performspower allocation and precoding on the symbols as indicated in thefollowing Formula.

$\begin{matrix}\lbrack {{Math}.\mspace{14mu} 3} \rbrack & \; \\\begin{matrix}{x_{i,u} = {W_{i,u}P_{i,u}s_{i,u}}} \\{= \begin{bmatrix}x_{i,u,0,0} & \ldots & x_{i,u,0,{N_{{EL},{TTL}} - 1}} \\\vdots & \ddots & \vdots \\x_{i,u,{N_{AP} - 1},0} & \ldots & x_{i,u,{N_{AP} - 1},{N_{{EL},{TTL}} - 1}}\end{bmatrix}} \\{= \begin{bmatrix}x_{i,u,0} \\\vdots \\x_{i,u,{N_{AP} - 1}}\end{bmatrix}}\end{matrix} & (3) \\\lbrack {{Math}.\mspace{14mu} 4} \rbrack & \; \\{x_{i,u,p} = \lbrack {x_{i,u,p,0}\mspace{14mu} \ldots \mspace{14mu} x_{i,u,p,{N_{{EL},{TTL}} - 1}}} \rbrack} & (4) \\\lbrack {{Math}.\mspace{14mu} 5} \rbrack & \; \\{W_{i,u} = \begin{bmatrix}w_{i,u,0,0} & \ldots & w_{i,u,0,{N_{{SL},i,u} - 1}} \\\vdots & \ddots & \vdots \\w_{i,u,{N_{{AP},i} - 1},0} & \ldots & w_{i,u,{N_{{AP},i} - 1},{N_{{SL},i,u} - 1}}\end{bmatrix}} & (5) \\\lbrack {{Math}.\mspace{14mu} 6} \rbrack & \; \\{P_{i,u} = \begin{bmatrix}P_{i,u,0,0} & \ldots & P_{i,u,0,{N_{{SL},i,u} - 1}} \\\vdots & \ddots & \vdots \\P_{i,u,{N_{{SL},i,u} - 1},0} & \ldots & P_{i,u,{N_{{SL},i,u} - 1},{N_{{SL},i,u} - 1}}\end{bmatrix}} & (6)\end{matrix}$

Here, N_(AP,i) indicates the number of transmitting antenna ports (orthe number of transmitting antennas) of the transmission device i, andbasically, a relation of N_(SL,i,u)≦N_(AP,i) is desirable. N_(EL,TLL)indicates the number of elements to be described below. W indicates aprecoding matrix, and it is desirable that an element be a complexnumber or a real number. P indicates a power allocation matrix, and itis desirable that an element is a real number, and it is desirable thatit is a diagonal matrix as indicated in the following Formula.

$\begin{matrix}\lbrack {{Math}.\mspace{14mu} 7} \rbrack & \; \\{P_{i,u} = \begin{bmatrix}P_{i,u,0,0} & 0 & \ldots & 0 \\0 & P_{i,u,1,1} & \ddots & \vdots \\\vdots & \ddots & \ddots & 0 \\0 & \ldots & \ldots & P_{i,u,{N_{{SL},u} - 1},{N_{{SL},u} - 1}}\end{bmatrix}} & (7)\end{matrix}$

After the power allocation and the precoding, the transmission devicemultiplexes signals for each transmitting antenna port as indicated inthe following Formula. For multiplexing of signals, for example,superposition multiplexing, superposition coding (SPC), multiusersuperposition transmission (MUST), non-orthogonal multiple access(NOMA), or the like can be employed.

$\begin{matrix}\lbrack {{Math}.\mspace{14mu} 8} \rbrack & \; \\{x_{i} = {\sum\limits_{u \in U_{i}}\; x_{i,u}}} & (8)\end{matrix}$

Here, U_(i) indicates a set of indices of the reception device u withwhich the transmission device i multiplexes signals.

A subsequent process is signal processing for each transmitting antennaport p and for each GFDM symbol g. As illustrated in FIG. 11, first, thetransmission device develops the symbols in the frequency directionthrough S/P conversion and then arranges the symbol on an element of apredetermined subsymbol and a predetermined subcarrier through resourceelement mapping. A rule of the arrangement may be decided by thetransmission device i and may be decided for the reception device u forwhich multiplexing is performed.

The element arranged in the subcarrier in the resource block r(0≦r<N_(RB)) as a result of resource element mapping will be described.

The number of subcarriers in a GFDM symbol and a target resource blockis indicated by N_(SC,r,g), and the number of subsymbols is indicated byN_(SS,r,g). In this case, the number of elements in the target GFDMsymbol is N_(EL,r,g)=N_(SC,r,g)×N_(SS,r,g).

An element arranged in a subsymbol m_(r,g) and a subcarrier k_(r,g) isindicated by x_(p,kr,g,mr,g). The transmission device first oversamplesthe respective elements (that is, for each subcarrier and eachsubsymbol) at a sampling rate N_(SR,r,g), and then filters them using afilter coefficient h_(p,kr,g,mr,g)(n). N is an index of a sample. InFIG. 11, k is an index of a subcarrier, and K is a total number ofsubcarriers.

A filtered sample is indicated as in the following Formula. An effect ofover-sampling is included in a term of a filter coefficient.

[Math. 9]

d _(p,k) _(r) _(,g,m) _(r) _(,g) =[d _(p,k) _(r) _(,g,m) _(r) _(,g)(0) .. . d _(p,k) _(r) _(,g,m) _(r) _(,g)(N _(SS,r,g) N _(SR,r,g)−1)]

d _(p,k) _(r) _(,g,m) _(r) _(,g)(n)=x _(p,k) _(r) _(,g,m) _(r) _(,g) h_(p,k) _(r) _(,g,m) _(r) _(,g)(n−m _(r,g) N _(SR,r,g))  (9)

After the filtering, the transmission device performs modulation andmultiplexing at a frequency f(k) for each subcarrier. If a set ofsubcarrier indexes included in the GFDM symbol g and the resource blockr is indicated by K_(r,g), c(n) of the multiplexed GFDM symbol isexpressed as in the following Formula.

$\begin{matrix}{\mspace{79mu} \lbrack {{Math}.\mspace{14mu} 10} \rbrack} & \; \\{\mspace{79mu} {{c_{p,g} = \lbrack {{c_{p,g}(0)}\mspace{14mu} \ldots \mspace{14mu} {c_{p,g}( {{N_{{SS},g}N_{{SR},g}} - 1} )}} \rbrack}{{c_{p,g}(n)} = {\sum\limits_{r = 0}^{N_{RB} - 1}\; {\sum\limits_{m_{r,g} = 0}^{N_{{SS},r,g} - 1}{\sum\limits_{k \in K_{r,g}}{{d_{p,k,m_{r,g}}(n)}\exp \{ {j\; 2\; \pi \; {f(k)}n\frac{T_{{SS},r,g}}{N_{{SR},r,g}}} \}}}}}}}} & (10)\end{matrix}$

The transmission device adds a CP and a cyclic suffix (CS) to eachmultiplexed GFDM symbol. The GFDM symbol to which the CP and the CS areadded is indicated as in the following Formula.

[Math. 11]

c _(CP,p,g) =[c _(p,g)(N _(SS,g) N _(SR,g) −N _(CP,g)) . . . c _(p,g)(N_(SS,g) N _(SR,g)−1)c _(p,g)(0) . . . c _(p,g)(N _(SS,g) N _(SR,g)−1)]  (11)

Here, N_(CP,g) indicates the number of samples of the CP added to theGFDM symbol g.

(2.2) Second Example

FIG. 12 is an explanatory diagram for describing an example of aconfiguration of a second transmission device supporting GFDM accordingto the present embodiment. The transmission device according to thesecond example first performs the process illustrated in FIG. 9 and thenperforms the process illustrated in FIG. 10 for each user, similarly tothe first example. Thereafter, the transmission device according to thesecond example performs the process illustrated in FIG. 12 for eachtransmitting antenna port. A difference with the first example is thatin the second example, a signal processing domain passes through anorder of time, frequency, and time. Specifically, in the first example,a part in which the process is regarded as the process for each user isregarded as a process in the time domain in the second example.

In the second example, the transmission signal processing of SC-FDEillustrated in FIG. 3 is extended to implement the transmission signalprocessing of GFDM. In the present transmission signal processing,particularly, there is a feature in which a process of performingfrequency conversion on a signal of a processing target in the timedomain takes place before the over-sampling. The transmission processwill be described below with reference to FIG. 12.

As illustrated in FIG. 12, the transmission device first performstime-to frequency conversion (for example, the DFT or the FFT) on thetime symbol sequence, and performs conversion into frequency components.If the time symbol sequence allocated to the GFDM symbol g and thesubcarrier k of the resource block r is indicated by x_(p,r,g), afrequency component that has undergone the frequency conversion isindicated as in the following Formulas.

$\begin{matrix}{\mspace{79mu} \lbrack {{Math}.\mspace{14mu} 12} \rbrack} & \; \\{\mspace{79mu} {\overset{\_}{x}\;}_{p,r,k,g}} & (12) \\{\mspace{79mu} \lbrack {{Math}.\mspace{14mu} 13} \rbrack} & \; \\{\mspace{79mu} \begin{matrix}{{\overset{\_}{x}\;}_{p,r,k,g} = {F_{N_{{SS},r,k,g}}x_{p,r,g}^{T}}} \\{= \lbrack {{\overset{\_}{x}}_{p,r,k,g,0}\mspace{14mu} \ldots \mspace{14mu} {\overset{\_}{x}}_{p,r,k,g,{N_{{SS},r,k,g} - 1}}} \rbrack^{T}}\end{matrix}} & (13) \\{\mspace{79mu} \lbrack {{Math}.\mspace{14mu} 14} \rbrack} & \; \\{\mspace{79mu} {x_{p,r,g} = \lbrack {x_{p,r,g,0}\mspace{14mu} \ldots \mspace{14mu} x_{p,r,g,{N_{{SS},r,k,g} - 1}}} \rbrack}} & (14) \\{\mspace{79mu} \lbrack {{Math}.\mspace{14mu} 15} \rbrack} & \; \\{F_{N} = \begin{bmatrix}{\exp ( {{- j}\; 2\pi \frac{0 \cdot 0}{N}} )} & \ldots & {\exp ( {{- j}\; 2\pi \frac{0 \cdot ( {N - 1} )}{N}} )} \\\vdots & \ddots & \vdots \\{\exp ( {{- j}\; 2\pi \frac{( {N - 1} ) \cdot 0}{N}} )} & \ldots & {\exp ( {{- j}\; 2\pi \frac{( {N - 1} ) \cdot ( {N - 1} )}{N}} )}\end{bmatrix}} & (15)\end{matrix}$

Here, F_(N) indicates a Fourier transform matrix of a size N.

After the conversion to the frequency component, the transmission deviceperforms the over-sampling for each subcarrier. Since the over-samplingprocess corresponds to repetition of the frequency component in thefrequency domain, it is indicated as in the following Formula.

$\begin{matrix}\lbrack {{Math}.\mspace{14mu} 16} \rbrack & \; \\\begin{matrix}{{\overset{\sim}{x}}_{p,r,k,g} = {I_{{OS},N_{{SS},r,k,g},N_{{SR},r,k,g}}{\overset{\_}{x}}_{p,r,k,g}^{T}}} \\{= \lbrack {{\overset{\sim}{x}}_{p,r,k,g,0}\mspace{14mu} \ldots \mspace{14mu} {\overset{\sim}{x}}_{p,r,k,g,{{N_{{SS},r,k,g}N_{{SR},r,k,g}} - 1}}} \rbrack^{T}} \\{= \lbrack {\underset{\underset{0 - {th}}{}}{{\overset{\_}{x}}_{p,r,k,g,0}\mspace{14mu} \ldots \mspace{14mu} {\overset{\_}{x}}_{p,r,k,g,{N_{{SS},r,k,g} - 1}}}\mspace{14mu} \ldots} } \\ {= \underset{\underset{{({N_{{SR},r,k,g} - 1})} - {th}}{}}{{{\overset{\_}{x}}_{p,r,k,g,0}\mspace{14mu} \ldots \mspace{14mu} {\overset{\_}{x}}_{p,r,g,{N_{{SS},r,k,g} - 1}}}\;}} \rbrack^{T}\end{matrix} & (16) \\\lbrack {{Math}.\mspace{14mu} 17} \rbrack & \; \\{I_{{OS},N,M} = \lbrack {\underset{\underset{0 - {th}}{}}{I_{N}}\mspace{14mu} \ldots \mspace{14mu} \underset{\underset{{({M - 1})} - {th}}{}}{I_{N}}} \rbrack^{T}} & (17)\end{matrix}$

Here, a matrix IN is a unit matrix of a size N. In other words,I_(OS,N,M) is a matrix in which M matrices I_(N) are arranged.

The transmission device performs filtering on each of a predeterminednumber of subcarriers after the over-sampling. For example, thetransmission device implements the filtering by multiplying eachfrequency component by a frequency filter coefficient. The predeterminednumber may be 1 or may be an arbitrary number of 1 or more. An arbitrarynumber of 1 or more may be, for example, the number of subcarriersincluded in a unit resource to be described below. The filtered signalis indicated as in the following Formula.

$\begin{matrix}\lbrack {{Math}.\mspace{14mu} 18} \rbrack & \; \\\begin{matrix}{{\overset{\_}{d}}_{p,r,k,g} = {{\overset{\_}{\Gamma}}_{p,r,k,g}{\overset{\sim}{x}}_{p,r,k,g}}} \\{= \lbrack {{{\overset{\_}{d}}_{p,r,k,g}(0)}\mspace{14mu} \ldots \mspace{14mu} {{\overset{\_}{d}}_{p,r,k,g}( {{N_{{SS},r,k,g}N_{{SR},r,k,g}} - 1} )}} \rbrack^{T}} \\{{\overset{\_}{\Gamma}}_{p,r,k,g} = \begin{bmatrix}{\overset{\_}{\gamma}\;}_{p,r,k,g,0,0} & \ldots & \begin{matrix}{\overset{\_}{\gamma}\;}_{p,r,k,g,0,} \\\;_{{N_{{SS},p,r,k,g}N_{{SR},p,r,k,g}} - 1}\end{matrix} \\\vdots & \ddots & \vdots \\\begin{matrix}{\overset{\_}{\gamma}}_{p,r,k,g,N_{{SS},p,r,k,g}} \\\;_{{N_{{SR},p,r,k,g} - 1},0}\end{matrix} & \ldots & \begin{matrix}{\overset{\_}{\gamma \;}}_{p,r,k,g,{{N_{{SS},p,r,k,g}N_{{SR},p,r,k,g}} - 1},} \\\;_{{N_{{SS},p,r,k,g}N_{{SR},p,r,k,g}} - 1}\end{matrix}\end{bmatrix}}\end{matrix} & (18)\end{matrix}$

Here, a matrix Γ is a filtering coefficient. This matrix can begenerally a diagonal matrix. In other words, the matrix Γ may beindicated as in the following Formula.

$\begin{matrix}{\mspace{79mu} \lbrack {{Math}.\mspace{14mu} 19} \rbrack} & \; \\{{\overset{\_}{\Gamma}\;}_{p,r,k,g} = \begin{bmatrix}{\overset{\_}{\gamma}\;}_{p,r,k,g,0,0} & 0 & \ldots & 0 & 0 \\0 & \ddots & \ddots & \ddots & 0 \\\vdots & \ddots & \ddots & \ddots & \vdots \\0 & \ddots & \ddots & \ddots & 0 \\0 & 0 & \ldots & 0 & \begin{matrix}{\overset{\_}{\gamma}\;}_{p,r,k,g,{{N_{{SS},p,r,k,g}N_{{SR},p,r,k,g}} - 1},} \\\;_{{N_{{SS},p,r,k,g}N_{{SR},p,r,k,g}} - 1}\end{matrix}\end{bmatrix}} & (19)\end{matrix}$

After the filtering, the transmission device performs mapping of thefrequency components in accordance with a predetermined rule andperforms frequency to time conversion (for example, the IDFT, the IFFT,or the like). The processes are indicated as in the following Formulas.

$\begin{matrix}\lbrack {{Math}.\mspace{14mu} 20} \rbrack & \; \\\begin{matrix}{{\overset{\sim}{d}}_{p,r,g} = {\sum\limits_{k \in K_{r,g}}{{\overset{\_}{A}}_{p,r,k,g}{\overset{\_}{d}}_{p,r,k,g}}}} \\{= \lbrack {{{\overset{\sim}{d}}_{p,r,g}(0)}\mspace{14mu} \ldots \mspace{14mu} {{\overset{\sim}{d}}_{p,r,g}( {N_{IDFT} - 1} )}} \rbrack^{T}}\end{matrix} & (20) \\\lbrack {{Math}.\mspace{14mu} 21} \rbrack & \; \\\begin{matrix}{c_{p,g} = {F_{N_{IDFT}}^{H}{\overset{N_{RB} - 1}{\sum\limits_{r = 0}}{\overset{\sim}{d}}_{p,r,g}}}} \\{= \lbrack {{c_{p,g}(0)}\mspace{14mu} \ldots \mspace{14mu} {c_{p,g}( {N_{IDFT} - 1} )}} \rbrack^{T}}\end{matrix} & (20)\end{matrix}$

Here, F_(H) is a Hermitian matrix of F. Further, A is a frequencymapping matrix of a size N_(IDFT)×N_(SS,r,k,g)×N_(SR,r,k,g). A (K,k′)component of a frequency mapping matrix A is 1 when a frequencycomponent k′ after the filtering on each subcarrier is arranged in afinal frequency component k. The (K,k′) component of a frequency mappingmatrix A is 0 when the frequency component k′ after the filtering oneach subcarrier is not arranged in the final frequency component k. Itis desirable that in the frequency mapping matrix A, a sum of elementsof each row be 1 or less, and a sum of elements of each column be 1 orless.

The transmission device adds the CP to each GFDM symbol after thefrequency to time conversion. The GFDM symbol to which the CP is addedis indicated as in the following Formula.

[Math. 22]

c _(CP,p,g) =[C _(p,g)(N _(SS,g) N _(SR,g) −N _(CP,g)) . . . c _(p,g)(N_(SS,g) N _(SR,g)−1) . . . c _(p,g)(0) . . . c _(p,g)(N _(SS,g) N_(SR,g)−1)]  (22)

Here, N_(CP,g) is the number of samples of CP added to the GFDM symbolg.

(2.3) Comparison of First Example and Second Example

The transmission device according to the first example and thetransmission device according to the second example generate the samewaveform theoretically. However, when subsymbols of different lengthsand/or subcarriers of different intervals are multiplexed as describedbelow, there is a difference in simplicity of implementation.

Specifically, in the case of the first example, when subcarriers withdifferent intervals are mixed, it is difficult to use a high-speedoperation such as the IDFT or the IFFT for multiplexing subcarriers.This is because it is difficult to input a signal whose resolution isnot constant for the IDFT and the IFFT.

On the other hand, in the case of the second example, it is possible touse the high-speed operations such as the IDFT or the IFFT for thefrequency to time conversion by setting the parameters appropriately. Inother words, the transmission device according to the second example ismore useful than the transmission device according to the first examplesince it is easier to implement.

(3) Parameter Setting

The parameter setting by the transmission device (for example, thesetting unit 151) according to the present embodiment will be describedbelow.

(3.1) Filtering Parameter Setting

The transmission device (for example, the setting unit 151) according tothe present embodiment variably sets at least one of intervals ofsubcarriers and time lengths of subsymbols included in a unit resourceconfigured with one or more subcarriers or one or more subsymbols. Here,the unit resources may be a unit of a frequency resource (for example, aresource block or a component carrier), a unit of a time resource (forexample, a GFDM symbol, a subframe, or the like), or a combination of afrequency resource and a time resource. The transmission device (forexample, the transmission processing unit 153) performs the filtering onthe basis of this setting. Specifically, the transmission device (forexample, the transmission processing unit 153) variably sets thebandwidth of the filter on the basis of the set intervals of thesubcarriers. In the first or second configuration described above, sinceit is possible to perform the filtering for each of a predeterminednumber of subcarriers, it is possible to implement a resourceconfiguration of implementing the intervals of the subcarriers which arevariably set and the time lengths of the subsymbols which are variablyset. For example, the transmission device according to the presentembodiment can multiplex subsymbols of different time lengths and/orsubcarriers of different intervals in the same GFDM symbol period. Anexample of the configuration of the GFDM symbol is illustrated in FIG.13.

As illustrated in FIG. 13, the transmission device (for example, thesetting unit 151) can set different values as the subsymbol length andthe subcarrier interval for each unit resource. However, thetransmission device sets the same value as the subcarrier interval andthe subsymbol length within the unit resource. For example, in theexample illustrated in FIG. 13, the subcarrier interval and subsymbollength are the same in one resource block. In a multi-user system, whena resource block is set as a frequency resource allocation unit, such asetting makes it possible to set subsymbol length and subcarrierinterval to predetermined values for one user. Thus, it is possible tosimplify the transmission process and the reception process. Thetransmission device (for example, the setting unit 151) can setdifferent values as the subsymbol length and the subcarrier interval inunits of GFDM symbols or in units of subframes.

Further, it is desirable that different unit resources be the same in avalue of the product of the number of subcarriers and the number ofsubsymbols. For example, in the example illustrated in FIG. 13, theproducts of the number of subcarriers and the number of subsymbols of aplurality of resource blocks multiplexed in the same GFDM symbol periodare all eight. As a result, it is possible to simplify the configurationof the transmission device and the configuration of the reception device(that is, the transmission process and the reception process) when avariable parameter is introduced.

The transmission device (for example, the setting unit 151) can variablyset the subcarrier interval. For example, the transmission device mayset an integer multiple of a minimum settable value set in the system 1as the subcarrier interval. Further, the transmission device can set avalue by which the bandwidth of the unit resource is divisible as thesubcarrier interval. Through this setting, the transmission device isable to use up all usable frequency resources without waste. The minimumvalue of the subcarrier interval is preferably equal to the subcarrierinterval when the number of subsymbols in the GFDM symbol is 1.

The transmission device (for example, the setting unit 151) can variablyset the subsymbol length. For example, the transmission device may setan integer multiple of a minimum settable value set in the system 1 asthe subsymbol length. Further, the transmission device may set a valueby which a time length of the unit resource is divisible as thesubsymbol length. Through this setting, the transmission device is ableto use up all usable time resources without waste. The minimum value ofthe subsymbol length is preferably equal to the subsymbol length whenthe number of subcarriers in the resource block is 1.

The following table shows an example of a range of parameters related toresources that can be used in the system 1 according to the presentembodiment.

TABLE 2 Parameters Values Remarks subsymbol minimum same as subsymbollength length value when number of subcarriers is 1 maximum same as GFDMsymbol value length number of minimum 1 value of product of subsymbolsvalue number of subsymbols and number of subcarriers is constant maximummaximum value of number value of product of value of subcarriers numberof subsymbols and number of subcarriers is constant subcarrier minimumsame as subcarrier interval interval value when number of subsymbols is1 maximum same as resource block value bandwidth (or same as value ofproduct of resource block bandwidth and total number of resource blocksallocated to target signal) number of minimum 1 value of product ofsubcarriers value number of subsymbols and number of subcarriers isconstant maximum maximum value of number value of product of value ofsubsymbols number of subsymbols and number of subcarriers is constant

In FIG. 13, a state before the CP is added is illustrated. Thetransmission device (for example, the transmission processing unit 153)adds the CP of the same time length to one or more unit resources of anaddition target. An example of a state after the CP is added isillustrated in FIG. 14. In the example illustrated in FIG. 14, a copy ofa predetermined length part in a second half of the GFDM symbol coveringthe entire area of the component carrier is added to a head of the GFDMsymbol.

(3.2) Setting of Subcarrier Interval and Subsymbol Length

FIG. 15 is a flowchart illustrating an example of the flow of theparameter setting process performed in the transmission device (forexample, the setting unit 151) according to the present embodiment.Here, as an example, possible values of the subsymbol length and thesubcarrier interval are assumed to be discrete values. Further, thetransmission device is assumed to select the subsymbol length and thesubcarrier interval to be set from combinations of a plurality ofsubsymbol lengths and subcarrier intervals predetermined in the system1.

As illustrated in FIG. 15, the transmission device identifies a resourceblock to which a target signal is allocated (step S202). Then, thetransmission device acquires a combination of parameters usable in theidentified resource block (step S204).

Then, the transmission device identifies the reception device for thetarget signal (step S206). In place of or in addition to this step, thetransmission device may identify a type of reception device of thetarget signal. Then, the transmission device acquires conditions ofparameters (that is, the subsymbol length and the subcarrier interval)corresponding to the identified reception device (and/or the type ofreception device) (step S208). The conditions of the parameterscorresponding to the reception device will be described below.

Then, the transmission device identifies a type of information carriedby the target signal (step S210). In place of or in addition to thisstep, the transmission device may identify a type of application relatedto the information carried by the target signal. Then, the transmissiondevice acquires conditions of parameters corresponding to the identifiedtype of information (and/or the type of application) (step S212). Theconditions of the parameters corresponding to the type of informationwill be described below.

Then, the transmission device sets the subsymbol length on the basis ofthe combination of parameters acquired in step S204 and the conditionsacquired in step S208 (step S214). Further, the transmission device setsthe subcarrier interval on the basis of the combination of parametersacquired in step S204 and the conditions acquired in step S212 (stepS216).

Then, the process ends.

Next, the conditions of parameters corresponding to the reception devicewill be described. An example of the conditions is shown in thefollowing table.

TABLE 3 Conditions of parameter Type of reception Subsymbol deviceSubcarrier interval Filter coefficient length there is small sharp bandsmall interference limitation cancellation capability there is largegentle band large interference limitation cancellation capability

As shown in the above table, the subcarrier interval, the filtercoefficient, and the subsymbol length may be set in accordance with tothe type of reception device. Specifically, the transmission device (forexample, the setting unit 151) may set a filter according to aninterference cancellation capability of the reception device of thetransmission target. In accordance with this setting, for example, thetransmission device (for example, the transmission processing unit 153)may apply a filter in which a filter coefficient with a sharp bandlimitation is set when the reception device has the interferencecancellation capability or a high interference cancellation capability.Further, the transmission device (for example, the transmissionprocessing unit 153) may apply a filter in which a filter coefficientwith a gentle band limitation is set when the reception device has nointerference cancellation capability or a low interference cancellationcapability. As a result, when the reception device has no or lowinterference cancellation capability, at the reception device side,interference cancellation is unnecessary, and the load of theinterference cancellation process can be reduced. This is advantageousparticularly when a device which is small and requires low powerconsumption such as the MTC device or the IoT device is accommodated inthe system 1. The filter coefficient with the gentle band limitation maybe a filter coefficient corresponding to a root-raised-cosine (RRC)filter. Further, the filter coefficient with the sharp band limitationmay be a filter coefficient corresponding to a raised-cosine (RC)filter. Further, when the filter coefficient with the gentle bandlimitation is set, a larger subcarrier interval may be set than when thefilter coefficient with the gentle band limitation is not set. Fromanother point of view, the filter coefficient with the sharp bandlimitation has a smaller roll-off factor, and the filter coefficientwith the gentler band limitation has a characteristic of having largerroll-off factor.

Further, the transmission device may set the large subcarrier intervalfor the reception device with the low signal processing capability suchas the MTC device or the IoT device. Thus, it is possible to reduceinfluence of inter-subsymbol interference and inter-subcarrierinterference, and it is possible to reduce the load of the interferencecancellation process in the reception device.

As described above, the transmission device can set the parameters inaccordance with the performance or the request of the reception device.Thus, the transmission device can deal with various data rates, delayamounts, signal processing complexity, or the like.

Next, the conditions of parameters corresponding to the type of theinformation (for example, application) carried by the target signal willbe described. An example of the conditions is shown in the followingtable.

TABLE 4 About QoS About parameter Packet Packet Example of Example ofResource Delay Error Example subsymbol subcarrier QCI Type PriorityBudget Loss Rate Services length interval 1 Guaranteed 2 100 msec10{circumflex over ( )}−2 VoIP Call T_(SS, 1) ΔF_(SC, 1) 2 Bit Rate 4150 msec 10{circumflex over ( )}−3 Video Call T_(SS, 2) ΔF_(SC, 2) 3 3 50 msec Online T_(SS, 3) ΔF_(SC, 3) Gaming (Real Time) 4 5 300 msec10{circumflex over ( )}−6 Video T_(SS, 4) ΔF_(SC, 4) Streaming 5 Non- 1100 msec IMS Signaling T_(SS, 5) ΔF_(SC, 5) 6 Guaranteed 6 300 msecVideo, TCP T_(SS, 6) ΔF_(SC, 6) Bit Rate Based Services (e.g. Email,Chat, FTP, etc.) 7 7 100 msec 10{circumflex over ( )}−3 Voice, Video,T_(SS, 7) ΔF_(SC, 7) Interactive Gaming 8 8 300 msec 10{circumflex over( )}−6 Video, TCP T_(SS, 8) ΔF_(SC, 8) Based Services (e.g. Email, Chat,FTP, etc.) 9 9 T_(SS, 9) ΔF_(SC, 9)

In the above table, an example of conditions of correspondingapplications (that is, services) and corresponding parameters of eachQOS class identifier (QCI) obtained by classifying a quality of service(QoS) is shown. For example, the transmission device (for example, thesetting unit 151) may set at least one of the subsymbol length and thesubcarrier interval in accordance with the processing capacity of thereception device and the application type (for example, the QCI) withreference to the above table.

A setting example based on delay tolerance (Packet Delay Budget in theabove table) will be described as an example of the setting method. Forexample, the transmission device may set the subsymbol length such thatthe subsymbol length decreases as the delay tolerance decreases.Further, the transmission device may set the subcarrier interval suchthat the subcarrier interval increases as the delay tolerance decreases.This is because as the delay tolerance decreases, a shorter delay timeis required, and it is desirable that reception and the reception deviceside perform demodulation promptly in order. Thus, the transmissiondevice can set the subsymbol length and the subcarrier interval so thata relation of the following Formula is satisfied.

[Math. 23]

T _(SS,3) ≦T _(SS,1) =T _(SS,5) =T _(SS,7) ≦T _(SS,2) ≦T _(SS,4) =T_(SS,6) =T _(SS,8) =T _(SS,9),

ΔF _(SC,9) =ΔF _(SC,8) =ΔF _(SC,6) =ΔF _(SC,4) ≦ΔF _(SC,2) ≦ΔF _(SC,7)=ΔF _(SC,7) =ΔF _(SC,5) =ΔF _(SC,1) ≦ΔF _(SC,3)  (23)

As another example of the setting method, a setting example based on apriority (Priority in the above table) will be described. For example,the transmission device may set the subsymbol length such that as thepriority increases, the subsymbol length decreases. For example, thetransmission device may set the subcarrier interval such that as thepriority increases, the subcarrier interval increases. Thus, thetransmission device can set the subsymbol length and the subcarrierinterval so that a relation of the following Formula is satisfied.

[Math. 24]

T _(SS,5) ≦T _(SS,1) ≦T _(SS,3) ≦T _(SS,2) ≦T _(SS,4) ≦T _(SS,6) ≦T_(SS,7) ≦T _(SS,8) ≦T _(SS,9),

ΔF _(SC,9) ≦ΔF _(SC,8) ≦ΔF _(SC,7) ≦ΔF _(SC,6) ≦ΔF _(SC,4) ≦ΔF _(SC,2)≦ΔF _(SC,3) ≦ΔF _(SC,1) ≦ΔF _(SC,5)  (24)

Further, the transmission device may set the parameters in accordancewith a moving speed of the reception device. The conditions of theparameters corresponding to the moving speed of the reception devicewill be described below. An example of the conditions is shown in thefollowing table. The transmission device (for example, the setting unit151) may set at least one of the subsymbol length and the subcarrierinterval in accordance with the moving speed of the reception devicewith reference to the above table.

TABLE 5 Mobility category Moving speed of Examples of Examples of indexdevice (e.g., km/h) subsymbol length subcarrier interval 0 v₀ ≦ v < v₁T_(SS,0) ΔF_(SC,0) 1 v₁ ≦ v < v₂ T_(SS,1) ΔF_(SC,1) 2 v₂ ≦ v < v₃T_(SS,2) ΔF_(SC,1) 3 v₃ ≦ v < v₄ T_(SS,3) ΔF_(SC,1) . . . . . . . . . .. .

In the above table, a mobility category index, the moving speed, anexample of the subsymbol length, and an example of the subcarrierinterval are associated with one another. In the table above, as themobility category index increases, the moving speed increases.

In GFDM, the subcarrier interference is considered to occur due to theDoppler effect and the Doppler spread caused by movement. For thisreason, the transmission device sets the subsymbol length and thesubcarrier interval corresponding to the moving speed or the mobilitycategory index. As a result, it is possible to prevent degradation intransmission quality. Specifically, the transmission device can set thesubsymbol length and the subcarrier interval so that a relation thefollowing Formula is satisfied.

[Math. 25]

T _(SS,3) ≧T _(SS,2) ≧T _(SS,1) ≧T _(SS,0)

ΔF _(SC,0) ≦ΔF _(SC,1) ≦ΔF _(SC,2) ≦ΔF _(SC,3)  (25)

In other words, it is desirable that as the moving speed increases, thesubcarrier interval is increased relatively, or the subsymbol length isdecreased relatively.

(3.3) Setting of Number of Subcarriers and Number of Subsymbols

The transmission device (for example, the setting unit 151) variablysets the subcarrier interval and the subsymbol length. In other words,the transmission device can variably set the number of subcarriers andthe number of subsymbols. The transmission device may set the parametersso that a predetermined relation is established between the number ofsubcarriers and the number of subsymbols in order to further improve thestability of the operation.

For example, the transmission device may be set so that at least one ofthe number of subcarriers and the number of subsymbols is an odd number.Through this setting, the stability of the equalization process in thereception device can be improved.

As a method of counting the number of subsymbols here, it is desirableto count the number of subsymbols per GFDM symbol in the system 1.Further, as the method of counting the number of subcarriers here, it isdesirable to count the number of subcarriers in a total bandwidth of thesystem 1. However, when a unit of a predetermined frequency bandwidthsuch as a resource block is introduced, the number of subcarriers perresource block may be counted as the method of counting the number ofsubcarriers.

Further, as the method of counting the number of subcarriers and thenumber of subsymbols, it is desirable to count subcarriers andsubsymbols on which information is actually carried. In other words, itis desirable to exclude a subcarrier that is present on the system butdoes not actually carry information such as a null subcarrier from acounting target.

On the basis of the above-described methods, a relation between thenumber of subcarriers and the number of subsymbols is summarized in thefollowing table. Parameters whose stability is “OK” indicate a settingin which the operation of the reception device is stable (that is, adesirable system configuration). Hatched parameters whose stability is“NG” in the table indicate a setting in which the operation of thereception device is unstable (that is, an undesirable systemconfiguration).

(3.4) Setting of Filter Coefficient (Transmission Device Side)

As described above, the transmission device (for example, thetransmission processing unit 153) performs filtering for eachsubcarrier. The type of filter may be the same irrespective of thesubcarrier interval or may differ in accordance with the subcarrierinterval.

For example, the transmission device may select a filter in accordancewith the subcarrier interval. Thus, the transmission device can controlthe influence of inter-subsymbol interference and inter-subcarrierinterference. Specifically, the transmission device may apply a filterin which a filter coefficient with a sharper band limitation as thesubcarrier interval decreases is set and apply a filter in which afilter coefficient with a gentler band limitation as the subcarrierinterval decreases is set. As a result, the load of the interferencecancellation process in the corresponding reception device can bereduced. In addition to the filter, the transmission device may set aroll-off coefficient of the filter in accordance with the subcarrierinterval.

FIG. 16 is a flowchart illustrating an example of the flow of the filtercoefficient setting process performed in the transmission deviceaccording to the present embodiment.

As illustrated in FIG. 16, first, the transmission device sets thesubcarrier interval (step S302). For example, as described above withreference to FIG. 15, the transmission device may set the subcarrierinterval in accordance with the type of reception device and the type ofinformation carried by the signal.

Then, the transmission device determines whether or not the subcarrierinterval is a determined to be threshold value or more (step S304). Whenthe subcarrier interval is a threshold value or more (YES in step S304),the transmission device sets the filter coefficient with the gentle bandlimitation (step S306). Specifically, the transmission device may setthe filter coefficient corresponding to the RRC filter. On the otherhand, when the subcarrier interval is determined to be less than athreshold value (NO in step S304), the transmission device sets thefilter coefficient with the sharp band limitation (step S308).Specifically, the transmission device may set the filter coefficientcorresponding to the RC filter.

Then, the process ends.

(Reception Device Side)

As described above, the transmission device variably sets the subcarrierinterval and the subsymbol length. For this reason, the reception device(for example, the reception processing unit 241) performs the receptionprocess in accordance with the parameters set in the transmissiondevice.

For example, the reception device may switch whether or not theinterference cancellation function is enabled or disabled in accordancewith the subcarrier interval. An example of this process will bedescribed in detail with reference to FIG. 17.

FIG. 17 is a flowchart illustrating an example of the flow of a processof switching the interference cancellation function performed in thereception device according to the present embodiment.

As illustrated in FIG. 17, first, the reception device checks thesubcarrier interval (step S402). For example, the reception deviceacquires information indicating the subcarrier interval from systeminformation or control information.

Then, the reception device determines whether or not the subcarrierinterval is a threshold value or more (step S404). When the subcarrierinterval is determined to be a threshold value or more (YES in stepS404), the reception device disables the interference cancellationfunction (step S406). Here, as a reception method when the interferencecancellation function is disabled, for example, a matched filter may beemployed. This is because the band limitation by the filter is gentle,and the influence of inter-subsymbol interference and inter-subcarrierinterference is suppressed. On the other hand, when the subcarrierinterval is determined to be less than a threshold value (NO in stepS404), the reception device enables the interference cancellationfunction (step S408). Here, as a reception method when the interferencecancellation function is enabled, Zero-Forcing (ZF), minimum meansquared error (MMSE), successive interference cancellation (SIC),parallel interference cancellation (PIC), iterative interferencecancellation (iterative cancellation), or turbo interferencecancellation (turbo cancellation) may be employed.

Then, the process ends.

(Filter Coefficient)

Next, the filter coefficient corresponding to the subcarrier intervalwill be described in further detail with reference to FIGS. 18 and 19.

FIG. 18 is a diagram for describing the filter coefficient correspondingto the subcarrier interval according to the present embodiment. FIG. 18illustrates a graph in which a horizontal axis indicates the roll-offfactor, and a vertical axis indicates a condition number of anequivalent channel matrix of GFDM. A difference in line type correspondsto a difference in the subcarrier interval. C=1 corresponds to asubcarrier interval in OFDM of the related art, C=3 corresponds to asubcarrier interval which is three times the subcarrier interval in OFDMof the related art, and C=7 corresponds to a subcarrier interval whichis 7 times the subcarrier interval in OFDM of the related art.

The reception device basically decodes signals through a process ofcorrecting the equivalent channel matrix of GFDM (for example,equalization by an inverse matrix, zero forcing, a least square errortechnique, or the like). As the condition number of the equivalentchannel matrix decreases, the accuracy of the inverse matrix increases,and thus degradation in performance of the reception process can be alsoexpected to be prevented. In other words, a filter coefficient in whichthe condition number is minimum is an optimum filter coefficient.Referring to FIG. 18, the optimum roll-off factor in which the conditionnumber is minimum differs in accordance with the subcarrier interval andhas a value that decreases as the subcarrier interval increases. Forexample, in the case of C=1 in which the subcarrier interval is smallestin FIG. 18, the optimum roll-off factor is around 0.1. In the case ofC=3 in which the subcarrier interval is intermediate in FIG. 18, theoptimum roll-off factor is 0.04736. In the case of C=7 in which thesubcarrier interval is largest in FIG. 18, the optimum roll-off factoris 0.02. Therefore, it is desirable to employ the roll-off factor thatdecreases as the subcarrier interval increases.

In addition to the condition number of the equivalent channel matrix,the accuracy of the inverse matrix can be expected to increase as a ranknumber of the equivalent channel matrix increases (is closer to a fullrank).

FIG. 19 is a diagram for describing the filter coefficient correspondingto the subcarrier interval according to the present embodiment. FIG. 19illustrates a simulation result of a bit error rate (BER) characteristicwith respect to Eb/N0 using the roll-off factor as a parameter. In FIG.19, the BER (RCn, C=1) of a signal of the subcarrier interval serving asa reference and the BER (RCw, C=3) of a signal of the subcarrierinterval which is three times the reference are plotted. Further, for aroll-off factor α, 0.9, 0.04736 (an optimum value of the roll-off factorin the case of C=3 in FIG. 18) and 0 are plotted. The zero forcing maybe employed as the reception method. As illustrated in FIG. 19, when thecase in which the roll-off factor is 0 for RCw is compared with the casewhere the roll-off factor is 0.4736 which is the optimum value, theimprovement effect of the BER by optimization of the roll-off factor isconfirmed. In other words, it is confirmed that optimization of theroll-off factor leads to not only optimization of the condition numberof the equivalent channel matrix illustrated in FIG. 18 but alsoimprovement in terms of the reception performance (BER characteristics).

In the GFDM system, the subcarrier interval and the filter coefficientmay be set as continuous values or may be set as a plurality of discretevalues. If it is considered that the setting of the subcarrier intervaland the filter coefficient is exchanged as the control informationbetween the transmission device and the reception device, that thelatter case is suitable for reducing the overhead of the controlinformation. On the other hand, in the former case, it is possible toperform an optimum setting finely in accordance with a radio wavepropagation environment, a type of data to be transmitted and received,or a type of service.

The transmission device (for example, the transmission processing unit153) includes information indicating setting content of the subcarrierinterval and the filter coefficient in the control information andtransmits the resulting control information to the reception device.Here, when the subcarrier interval and the filter coefficient are set asa plurality of discrete values, for example, a combination of an indexand set values of the subcarrier interval and the filter coefficientindicated by the index is recognized in common between the devices inthe system 1 in advance. Then, the transmission device includes theindex corresponding to the set subcarrier interval and the filtercoefficient in the control information, and notifies the receptiondevice of the set value. An example of the combination of the index andthe set values indicated by the regarding the subcarrier interval andthe filter coefficient is illustrated in the following Table 7.

In the following Table 7, the subcarrier interval and the roll-offfactor are defined for each index of the subcarrier interval. It is alsopossible to interpret the roll-off factor as being linked with thesubcarrier interval.

TABLE 7 Subcarrier Spacing Subcarrier Index Spacing Roll-off FactorRemarks 0 Δf0 (<=Δf1) α0 (>=α1) minimum value of subcarrier interval maybe used as reference (default) of subcarrier interval of entire system 1Δf1 (<=Δf2) α1 (>=α2) 2 Δf2 (<=Δf3) α2 (>=α3) 3 Δf3 (<=Δf4) α3 (>=α4) .. . . . . . . .

A notification of a set value other than the subcarrier interval and thefilter coefficient may also be given using an index in a similar mannerto that described above. Other examples of the combination of the indexand the set values indicated by the index are illustrated in thefollowing Tables 8 to 12.

In the following Table 8, the number of subcarriers (for example, thenumber of subcarriers per resource block) and the roll-off factor aredefined for each index of the subcarrier interval.

TABLE 8 Number of Subcarriers Subcarrier (per Resource Roll-off SpacingIndex Block) Factor Remarks 0 Nsc0 (>=Nsc1) α0 (>=α1) number ofsubcarriers when subcarrier interval is minimum may be used as reference(or default) of number of subcarriers of entire system 1 Nsc1 (>=Nsc2)α1 (>=α2) 2 Nsc2 (>=Nsc3) α2 (>=α3) 3 Nsc3 (>=Nsc4) α3 (>=α4) . . . . .. . . .

In the following Table 9, the subsymbol length and the roll-off factorare defined for each index of the subsymbol length.

TABLE 9 Subsymbol Subsymbol Roll-off Length Index Length Factor Remarks0 Tss0 (>=Tss1) α0 (>=α1) subsymbol length when subcarrier interval isminimum may be used as reference (or default) of subsymbol length ofentire system 1 Tss1 (>=Tss2) α1 (>=α2) 2 Tss2 (>=Tss3) α2 (>=α3) 3 Tss3(>=Tss4) α3 (>=α4) . . . . . . . . .

In the following Table 10, the number of subsymbols (for example, thenumber of subcarriers per GFDM symbol) and the roll-off factor aredefined for each index of the subsymbol length.

TABLE 10 Number of Subsymbols Subsymbol (per GFDM Roll-off Length IndexSymbol) Factor Remarks 0 Nss0 (<=Nss1) α0 (>=α1) number of subsymbolswhen subcarrier interval is minimum may be used as reference (default)of number of subsymbols of entire system 1 Nss1 (<=Nss2) α1 (>=α2) 2Nss2 (<=Nss3) α2 (>=α3) 3 Nss3 (<=Nss4) α3 (>=α4) . . . . . . . . .

In the following Table 11, TTI and a ratio of TTI to a GFDM symbollength are defined for each TTI index.

TABLE 11 Ratio of TTI to GFDM Symbol TTI Index TTI Length Remarks 0 TTI0δ0 (>=δ1) TTI is directly designated or (>=TTI1) indirectly designatedas ratio to GFDM symbol length 1 TTI1 δ1 (>=δ2) (>=TTI2) 2 TTI2 δ2(>=δ3) (>=TTI3) 3 TTI3 δ3 (>=δ4) (>=TTI4) . . . . . . . . .

In the following Table 12, a CP length and a ratio of a CP length to aGFDM symbol length are defined for each index of CP length.

TABLE 12 Ratio of CP Length to GFDM CP Symbol Length Index CP LengthLength Remarks 0 Tcp0 (>=Tcp1) τ0 (>=τ1) CP length is directlydesignated or indirectly designated as ratio to GFDM symbol length 1Tcp1 (>=Tcp2) τ1 (>=τ2) 2 Tcp2 (>=Tss3) τ2 (>=τ3) 3 Tcp3 (>=Tss4) τ3(>=τ4) . . . . . . . . .

(3.5) Over-Sampling Parameter Setting

The over-sampling parameters may be set in accordance with thetransmission process.

For example, for the first transmission device illustrated in FIGS. 9 to11, it is desirable that the sampling rate N_(SR,r,g) is a total numberof subcarriers or more. Further, when the subsymbol length and thesubcarrier interval are variable, the actual number of subcarriers maybe set as the total number of subcarriers (that is, a guard interval maynot be considered). Alternatively, the number of subcarriers when aminimum value that can be used in the system 1 is used as all thesubcarrier intervals (that is, a maximum of the total number ofsubcarriers that can be used in the system 1) may be set as the totalnumber of subcarriers. Further, when multiplexing of subcarriers isperformed through the IDFT or the IFFT, the IDFT size or IFFT size maybe set in the over-sampling parameter N_(SR,r,g).

For example, as the over-sampling parameter for the second transmissiondevice illustrated in FIG. 12, a smaller value than that in the case ofthe first transmission device may be set. For example, when atransmission filter coefficient corresponding to the RC filter or theRRC filter is employed, it is enough if the number of over-samplings isat most two. Of course, even in this case, the number over-samplings maybe 2 or more.

(3.6) Non-Use Frequency Domain

Difference Between Allocation Bandwidth and Use Bandwidth

The transmission device (for example, the setting unit 151) sets anon-use frequency domain (that is, bandwidth) in unit resourcesconfigured with one or more subcarriers or one or more subsymbols, andvariably sets at least one of the subcarrier interval and the subsymbollength in the other usable frequency domains. The transmission device(for example, the transmission processing unit 153) transmits signalsusing the use frequency domain (that is, bandwidth). The bandwidth ofthe unit resource is also referred to as an “allocation bandwidth.”Further, a bandwidth which is actually used excluding the non-usefrequency domain from the allocation bandwidth is also referred to as a“use bandwidth.” Through the setting of the non-use frequency domain, itis possible to simplify the transmission and reception process as willbe described below. Here, the frequency resources of the unit resourcesare typically resource blocks. Besides, here, the unit resources may bean arbitrary frequency channel such as a subband or a component carrier.

The transmission device switches whether or not the non-use frequencydomain is set in accordance with whether or not the subcarrier intervalsor the subsymbol time lengths are the same in a plurality of unitresources on the same time resources. Specifically, the transmissiondevice sets the non-use frequency domain when the subcarrier intervalsor the subsymbol time lengths are different in a plurality of unitresources on the same time resources. Thus, it is possible to reduceinter-unit resource interference in a situation in which orthogonalitybetween the unit resources (more accurately, between the subcarriers)collapses. Conversely, the transmission device does not set the non-usefrequency domain when the subcarrier intervals or the subsymbol timelengths are the same in a plurality of unit resources on the same timeresources. Thus, it is possible to use the frequency resources withoutwaste in the situation where orthogonality between the unit resources isheld. Here, a plurality of unit resources may refer to unit resourcesincluded in one frequency channel (for example, a component carrier orthe like) or may indicate unit resources included in a plurality offrequency channels. Further, bandwidths of the unit resources areassumed to be the same on the same time resources.

Hereinafter, a definition of the subcarrier interval will be describedwith reference to FIG. 20.

FIG. 20 is a diagram for describing the definition of the subcarrierinterval. A left drawing illustrates an example in which neighboringsubcarriers overlap, and a right drawing illustrates an example in whichneighboring subcarriers do not overlap. A plurality of definitions canbe given to the subcarrier, and three definitions will be describedhere.

A first definition is a definition in which the subcarrier interval isan interval of frequencies indicating specific positions of neighboringsubcarriers. For example, an interval indicated by reference numeral310A in FIG. 20 is the subcarrier interval. With reference to thereference numeral 310A, the subcarrier interval is an interval betweenpeak positions of the subcarriers but is not necessarily required to bethe interval between peak positions. For example, the subcarrierinterval may be an interval between 3 dB frequencies on the lower sidesof the subcarriers, an interval between 3 dB frequencies on the uppersides of the subcarriers, an interval between (n-th) zero-crossfrequencies on the lower sides, an interval between (n-th) zero-crossfrequencies on the upper sides, or the like.

A second definition is a definition in which the subcarrier interval isan interval of frequencies of specific positions of the subcarriers. Forexample, an interval indicated by reference numeral 310B in FIG. 20 isthe subcarrier interval. Specific positions may be an interval of 3 dBfrequencies on the lower side and the upper side of one subcarrier, aninterval between (n-th) zero-cross frequencies on the lower side and theupper side, or the like.

A third definition is a definition in which the subcarrier interval is areciprocal of the symbol length or the subsymbol length. Here, it isdesirable that the length of the CP is not included in the symbol lengthor the subsymbol length used for a calculation of the reciprocal.

The definitions of the subcarrier interval have been described above.Next, an example of setting the allocation bandwidth and the usebandwidth will be described with reference to FIG. 21.

FIG. 21 is a diagram illustrating an example of setting the allocationbandwidth and the use bandwidth according to the present embodiment. InFIG. 21, six examples of setting the allocation bandwidth and the usebandwidth are indicated by reference numerals 320 to 325. Bk indicatesthe allocation bandwidth, B′k indicates the use bandwidth, and bkindicates the subcarrier interval or a bandwidth of one subcarrier. k isan integer indicating an index of an example.

In FIG. 21, b0 is set as a reference subcarrier interval. Further, b0 isassumed to be a minimum subcarrier interval that can be set in thesystem 1. In FIG. 21, a side lobe part of a frequency component of thesubcarrier is omitted, but, in fact, there may be side lobes. Further,in FIG. 21, the side lobe part is not included in the bandwidth of thesubcarrier. Here, the subcarriers are assumed to be non-orthogonal, butmay be orthogonal.

The following Table 13 shows various set values in the respectivesettings indicated by reference numerals 320 to 325 in FIG. 21. Nk inthe table indicates the number of subcarriers in the allocatedbandwidth. The use bandwidth is calculated by B′k=bk×Nk as a valueobtained by multiplying the subcarrier interval by the number ofsubcarriers.

TABLE 13 Reference allocation subcarrier number of subcarriers usenumerals in bandwidth interval in allocation bandwidth FIG. 21 [Hz] [Hz]bandwidth [Hz] 320 B0 b0 N0 >= 1 B′0 == B0 321 B1 == B0 b1 == b0 1 <= N1< N0 B′1 <= B1 322 B2 == B0 b2 >= b0 N2 == 1 < N0 B′2 == B2 323 B3 == B0b3 >= b0 1 <= N3 < N0 B′3 == B3 324 B4 == B0 b4 >= b0 N4 == 1 < N0 B′4<= B4 325 B5 == B0 b5 >= b0 1 <= N5 < N0 B′5 <= B5

The cases indicated by reference numerals 320 to 325 will be describedbelow in detail.

In the case indicated by reference numeral 320, the allocation bandwidthand the use bandwidth are the same, and the reference subcarrierinterval is employed. This case relates to a method of using a band seenin the existing OFDMA or LTE. This case may be regarded as a referenceor default setting of the system 1.

In the case indicated by reference numeral 321, the use bandwidth isnarrower than the allocation bandwidth, and the reference subcarrierinterval is employed. In the case indicated by reference numeral 321,since both ends of the allocation bandwidth are empty, it is possible tomitigate interference from the adjacent areas (for example, neighboringresource blocks).

As can be seen from a comparison of reference numerals 320 and 321, thesystem 1 may set the number of subcarriers (for example, N1) included inthe unit resource in which a non-use domain is set to be the number ofsubcarriers (for example, N0) included in the unit resource in which anon-use domain is not set. As a result, the non-use frequency domain isset.

In the cases indicated by reference numerals 322 and 323, the allocationbandwidth and use bandwidth are the same, and a subcarrier intervallarger than the reference subcarrier interval is employed. In the caseindicated by reference numeral 322, unit resources are formed by onesubcarrier, and in the case illustrated by reference numeral 323, unitresources are formed by two subcarriers. In the system 1, it is possibleto simultaneously accommodate subcarriers of different subcarrierintervals in the CC, and these cases are cases that occur at this time.

In the case indicated by reference numeral 324, the use bandwidth isnarrower than the allocation bandwidth, the unit resources are formed byone subcarrier, and a subcarrier interval larger than the referencesubcarrier interval is employed. A subcarrier with an extended intervalenables decoding with a simple reception algorithm and implements strongresistance with respect to the Doppler effect under the high-speedmobile environment. However, when the reception algorithm is simplified,it is desirable to pay attention to interference from a neighboringsubcarrier (such as a subcarrier in a neighboring resource block). Inthis case, since both ends of the allocation bandwidth are empty, it ispossible to mitigate interference from the adjacent areas, and it ispossible to apply the simple reception algorithm.

In the case indicated by reference numeral 325, the use bandwidth isnarrower than the allocation bandwidth, the unit resources are formed bytwo subcarriers, and a subcarrier interval wider than the referencesubcarrier interval is employed. In this case, similarly to the caseindicated by reference numeral 324, since both ends of the allocationbandwidth are empty, it is possible to mitigate interference from theadjacent areas, and it is possible to apply a simple receptionalgorithm. However, in this case, since the subcarriers overlap eachother within the allocation bandwidth, it is desirable that thereception algorithm in which inter-subcarrier interference is consideredbe employed.

As can be seen from a comparison of reference numerals 322 and 324 andreference numerals 323 and 325, the system 1 may set the interval of thesubcarrier (for example, b3 or b5) included in the unit resource inwhich a non-use domain is set to be an interval of the subcarrier (forexample, b2 or b4) or less included in the unit resource in which thenon-use domain is not set. As a result, the non-use frequency domain isset.

In the above, the cases indicated by reference numerals 320 to 325 havebeen described in detail. The system 1 can mixedly accommodate one ormore cases in one frequency channel (for example, the CC) at the sametime among the cases indicated by reference numerals 320 to 325.

The allocation bandwidth Bk is preferably an integer multiple of theminimum subcarrier interval b0 assumed in the system. In other words,Bk=n×b0 is desirable. However, n is a positive integer.

For a unit of the allocation bandwidth (for example, the resourceblock), when there are a plurality of subcarriers in one unit, it isdesirable that the bandwidths of the subcarriers are equal. In otherwords, it is desirable that all values of Bk of the subcarriers arrangedin the allocation bandwidth Bk are equal.

Arrangement of Subcarriers

An arrangement of subcarriers when there is a difference between theallocation bandwidth and the use bandwidth will be described in detail.It is desirable that the arrangement of subcarriers satisfy at least oneof the following conditions.

A first condition is that the center of the allocation bandwidth Bk andthe center of B′k are identical or substantially identical to eachother.

A second condition is that empty (that is, the non-use frequency domain)is set at both ends of the allocation bandwidth Bk. In other words, thesecond condition is that only one side of the bandwidth Bk is not empty.

A third condition is that two empty bandwidths set at both ends of theallocation bandwidth Bk are set to be identical.

A fourth condition is that the empty bandwidths (including an empty areaother than both ends) in the allocation bandwidth Bk are set to beidentical.

A fifth condition is that when the number of subcarriers included in theallocation bandwidth Bk is odd, the center frequency of at least one ofthe subcarriers included in the allocation bandwidth Bk is identical orsubstantially identical to the center frequency of the allocationbandwidth Bk.

A sixth condition is that when the number of subcarriers included in theallocation bandwidth Bk is even, the center frequencies of allsubcarriers included in allocation bandwidth Bk are neither identicalnor substantially identical to the center frequency of allocationbandwidth Bk.

When the frequencies are substantially identical, it may mean that it iswithin an absolute allowable range or may mean that, for example, adeviation of several Hz to several tens of Hz is allowed. Also, when thefrequencies are substantially identical, it may mean that it is within arelative allowable range or may mean that a deviation of several % orseveral tens of % with respect to the subcarrier interval is allowed.

The transmission device sets the arrangement of subcarriers so that atleast one of the conditions is satisfied. An exemplary arrangement inthat case will be described with reference to FIGS. 22 to 25.

FIG. 22 is a diagram for describing an example of the arrangement ofsubcarriers according to the present embodiment. FIG. 22 illustrates anexample arrangement of subcarriers in the case in which the usebandwidth is narrower than the allocation bandwidth, and the unitresources are formed by three subcarriers. As indicated by referencenumeral 331, the first condition is satisfied. As indicated by referencenumeral 332, the second condition is satisfied. As indicated byreference numeral 333, the third condition is satisfied. As indicated byreference numeral 334, the fourth condition is satisfied. As indicatedby reference numeral 335, the fifth condition is satisfied.

FIG. 23 is a diagram for describing an example of the arrangement ofsubcarriers according to the present embodiment. FIG. 23 illustrates anexemplary arrangement of subcarriers in the case in which the usebandwidth is narrower than allocation bandwidth, and the unit resourcesare formed by three subcarriers. As indicated by reference numeral 341,the first condition is satisfied. As indicated by reference numeral 342,the second condition is satisfied. As indicated by reference numeral343, the third condition is satisfied. As indicated by reference numeral344, the fourth condition is satisfied. As indicated by referencenumeral 345, the fifth condition is satisfied.

FIG. 24 is a diagram for describing an example of the arrangement ofsubcarriers according to the present embodiment. FIG. 24 illustrates anexample arrangement of subcarriers in the case in which the usebandwidth is narrower than the allocation bandwidth, and the unitresources are formed by two subcarriers. As indicated by referencenumeral 351, the first condition is satisfied. As indicated by referencenumeral 352, the second condition is satisfied. As indicated byreference numeral 353, the third condition is satisfied. As indicated byreference numeral 354, the fourth condition is satisfied. As indicatedby reference numeral 356, the sixth condition is satisfied.

FIG. 25 is a diagram for describing an example of the arrangement ofsubcarriers according to the present embodiment. FIG. 25 illustrates anexample arrangement of subcarriers in the case in which the usebandwidth is narrower than the allocation bandwidth, and the unitresources are formed by two subcarriers. As indicated by referencenumeral 361, the first condition is satisfied. As indicated by referencenumeral 362, the second condition is satisfied. As indicated byreference numeral 363, the third condition is satisfied. As indicated byreference numeral 364, the fourth condition is satisfied. As indicatedby numeral 366, the sixth condition is satisfied.

The example arrangements of subcarriers have been described above.

In the cases indicated by reference numerals 321, 324, and 325illustrated in FIG. 21, at least one of the above conditions issatisfied. However, even in the cases indicated by reference numerals320, 322 and 323 illustrated in FIG. 21, at least one of the aboveconditions is satisfied when an empty bandwidth is considered to bezero. In other words, in all the cases illustrated in FIG. 21, thearrangement control is enabled on the basis of the above conditions.

The system 1 can cause influence of interference applied to thesubcarrier to be uniform by performing an arrangement in which at leastone of the above conditions is satisfied. Here, the interference meansinterference which a subcarrier in a certain allocation bandwidthreceives from a subcarrier of another bandwidth and interference which asubcarrier in a certain allocation bandwidth receives from anothersubcarrier in the same bandwidth.

Next, the flow of the processing related to the setting of the non-usefrequency domain will be described with reference to FIG. 26.

FIG. 26 is a flowchart illustrating an example of the flow of theprocess of setting the non-use frequency domain according to the presentembodiment. As illustrated in FIG. 26, the transmission device (forexample, the setting unit 151) first variably sets at least one of thesubcarrier interval and the subsymbol length (step S502). Then, thetransmission device (for example, the setting unit 151) determineswhether or not the subcarrier interval or the subsymbol length differsin a plurality of unit resources on the same time resources (step S504).Then, the transmission device (for example, the setting unit 151) setsthe non-use frequency domain (step S506) when the subcarrier interval orthe subsymbol length differs in a plurality of unit resources on thesame time resources, and does not set the non-use frequency domain (stepS508) when the subcarrier interval or the subsymbol length is the samein a plurality of unit resources on the same time resources. Then, thetransmission device (for example setting unit 151) sets the remainingparameters (step S510). Examples of the remaining parameters include thefilter coefficient, the over-sampling parameter, the number ofsubcarriers, and the number of subsymbols. Then, the transmission device(for example, the transmission processing unit 153 and the radiocommunication unit 120) performs transmission signal processing on thebasis of the above setting, and generates an RF signal (step S512).Then, the transmission device (for example, the antenna unit 110)transmits the generated RF signal (step S514). Then, the process ends.

(3.6) Parameter Limitation

Content of Limitation

Limitations may be imposed on the parameters of the transmission deviceand/or the reception device. As a result, the overhead is reduced, andimplementation is easy. In general, since the terminal device has a lotof limitations for the implementation of hardware and software, it isdesirable that a limit be imposed on the parameters of the terminaldevice.

In this regard, the base station 100 (for example, the setting unit 151)limits the number of parameter candidates that can be set in a pluralityof unit resources on the same time resources by the terminal device 200(corresponding to the transmission device or the reception device) to apredetermined number. Thus, it is possible to solve the problem oflimitations on the implementation of hardware and software of theterminal device. Here, a plurality of unit resources may refer to unitresources included in one frequency channel (for example, a componentcarrier or the like) or may refer to unit resources included in aplurality of frequency channels. In other words, limitations may beimposed on the parameters in one unit resource, or limitations may beimposed on the parameters in a plurality of unit resources.

The number of parameter candidates may be limited to a predeterminednumber in a plurality of frequency channels, and the number of parametercandidates may be limited to a predetermined number minus one in onefrequency channel.

The predetermined number may be 1 or an arbitrary number of 1 or more.

Parameter limitation may be imposed for each predetermined timeresource. As the predetermined time resource, for example, atransmission time interval (TTI), a subframe, a plurality of TTIs, aplurality of subframes, a radio frame, or the like is considered. Forexample, the parameters of the transmission device are limited so thatthe same parameters are set in the same time resources. However,different parameters are allowed to be set in different time resources.Similarly, the parameters of the reception device are limited so thatthe same parameters are set in the same time resources. However,different parameters can be allowed to be set in different timeresources

However, different parameter limitations are allowed to be imposed indifferent time resources. This is because one device can be used inparallel in a plurality of different use cases. As a use case, forexample, broadband communication (Enhanced Mobile Broadband (eMBB)),ultra reliable and low latency communication (URLLC)), machine typecommunication (MTC), or the like is considered. For example, differentlimitations in which a different use case is assumed for each timeresource may be imposed. In other words, the parameter limitationimposed on each time resource may be switched. Of course, switching neednot be performed over a plurality of time resources.

Further, parameter limitation may be imposed for each predeterminedfrequency resource. As the predetermined frequency resource, forexample, the entire frequency of the system, the frequency channel (forexample, the component carrier), the frequency block (for example, theresource block), or the like is considered. For example, the parametersof the transmission device are limited so that the same parameter is setin the same frequency resource. The same applies to the parameters ofthe reception device. However, different parameter limitations may beallowed to be imposed in different frequency resources.

The parameter limitation may differ between respective reception devicesor may be common to a plurality of reception devices. Similarly, theparameter limitation may differ between respective transmission devicesor may be common to a plurality of transmission devices.

Further, the parameter limitation may only be imposed on someparameters. For example, some parameters such as the subcarrier intervaland the subsymbol length may not be limited, and other parameters suchas the CP length and the TTI length may be limited.

The parameter limitation in the downlink communication of the cellularsystem will be specifically described below with reference to FIGS. 27to 32. Of course, the parameter limitation may be similarly performed inthe uplink communication, sidelink communication in device-to-device(D2D) communication, and the like.

FIG. 27 is a diagram for describing an example of the parameterlimitation according to the present embodiment. As illustrated in FIG.27, the base station 100 is a transmission device, and terminal devices200A and 200B are reception devices. Resources 400A are resources usedfor signals destined for the terminal device 200A, and resources 400 Bare resources used for signals destined for the terminal device 200B. Asillustrated in FIG. 27, the same parameters (here, the subcarrierinterval and the subsymbol length) are set within the same timeresources (here, the TTI) for each terminal device 200. As describedabove, in the example illustrated in FIG. 27, limitations are imposed onthe parameters.

FIG. 28 is a diagram for describing an example of the parameterlimitation according to the present embodiment. As illustrated in FIG.28, the base station 100 is a transmission device, and the terminaldevices 200A and 200B are reception devices. Resources 410A and 412A areresources used for signals destined for the terminal device 200A, andresources 410B and 412B are resources used for signals destined for theterminal device 200B. As illustrated in FIG. 28, different parameters(here, the subcarrier interval and the subsymbol length) are set withinthe same time resources (here, the TTI) in the resources 410A and 412Aused for signals destined for the terminal device 200A. Further,different parameters are set in the same time resources in the resources410B and 412B used for signals destined for the terminal device 200B. Asdescribed above, some different parameters may be allowed to be set.However, limitations may be imposed on other parameters such as the CPlength and/or the TTI length.

Here, in the examples illustrated in FIGS. 27 and 28, the parameterlimitation is imposed in one frequency channel (for example, a componentcarrier). On the other hand, the parameter limitation may be imposed ina plurality of frequency channels as illustrated in FIGS. 29 and 30.

FIG. 29 is a diagram for describing an example of the parameterlimitation according to the present embodiment. As illustrated in FIG.29, the base station 100 is a transmission device, and the terminaldevices 200A and 200B are reception devices. Resources 420A and 422A areresources used for signals destined for the terminal device 200A, andresources 420B and 422B are resources used for signals destined for theterminal device 200B. As illustrated in FIG. 29, the same parameters(here, the subcarrier interval and the subsymbol length) are set in thesame time resources (here, the TTI) even in different component carriersfor each terminal device 200. As described above, in the exampleillustrated in FIG. 27, limitations are imposed on the parametersrelated to a plurality of component carriers. Due to such limitations,even when the number of component carriers increases, it is possible toefficiently implement the reception process by causing the parametersfor signal processing to shared.

FIG. 30 is a diagram for describing an example of the parameterlimitation according to the present embodiment. As illustrated in FIG.30, the base station 100 is a transmission device, and the terminaldevices 200A and 200B are reception devices. Resources 430A and 432A areresources used for signals destined for the terminal device 200A, andresources 430B and 432B are resources used for signals destined for theterminal device 200B. As illustrated in FIG. 30, different parameters(here, the subcarrier interval and the subsymbol length) are set in thesame time resources (here, the TTI) in the resources 430A and 432A usedfor signals destined for the terminal device 200A. Different parametersare set in the same time resources in different component carriers inthe resources 430B and 432B used for signals destined for the terminaldevice 200B. As described above, different parameters may be allowed tobe set. However, limitations may be imposed on other parameters such asthe CP length and/or the TTI length.

Here, the parameter limitation imposed on the same time resources hasbeen described with reference to FIGS. 27 to 30. On the other hand, asillustrated in FIGS. 31 and 32, different parameter limits may beimposed on different time resources.

FIG. 31 is a diagram for describing an example of the parameterlimitation according to the present embodiment. As illustrated in FIG.31, the base station 100 is a transmission device, and the terminaldevices 200A and 200B are reception devices. Resources 440A and 442A areresources used for signals destined for the terminal device 200A, andresources 440B and 442B are resources used for signals destined for theterminal device 200B. As illustrated in FIG. 31, different parameters(here, the subcarrier interval and the subsymbol length) are set indifferent time resources (here, TTIs) for each terminal device 200. Asdescribed above, in the example illustrated in FIG. 31, it is allowed toimpose different parameter limitations between respective timeresources.

FIG. 32 is a diagram for describing an example of the parameterlimitation according to the present embodiment. As illustrated in FIG.32, the base station 100 is a transmission device, and the terminaldevices 200A and 200B are reception devices. Resources 450A and 452A areresources used for signals destined for the terminal device 200A, andresources 450B and 452B are resources used for signals destined for theterminal device 200B. As illustrated in FIG. 32, the same parameters(here, the subcarrier interval and the subsymbol length) are set indifferent time resources (here, TTIs) for each terminal device 200. Asdescribed above, in the example illustrated in FIG. 32, the sameparameter limitation is imposed even in different time resources. Theimplementation is easy when it is not allowed to impose differentparameter limitations in different time resources. Of course, switchingof the parameter limitation may be allowed in units of a plurality ofTTIs, a plurality of subframes, or one or more radio frame units, or thelike.

The following Table 14 shows a table in which the parameters of thetransmission device are summarized. Further, the following Table 15shows a table in which the parameters of the reception device aresummarized.

TABLE 14 Number of combinations of Number of parameters usable receptiondevices for transmission of (type of reception signal destined fordevice) one reception Particularly multiplexed in device in desirableone in Applicable predetermined predetermined time terms of cases timeresources resources implementation Downlink/ 1 (terminal 1 Particularlyuplink/ device/base desirable sidelink station) Downlink/ 1 (terminalplural uplink/ device/base sidelink station) Downlink/ plural (terminal1 Particularly sidelink device) desirable Downlink/ plural (terminalplural sidelink device)

TABLE 15 Number of Number of combinations of transmission parametersassumed devices (type of with regard to transmission reception ofsignals device) from one Particularly multiplexed in transmission devicedesirable one in Applicable predetermined in predetermined terms ofcases time resources time resources implementation Downlink/ 1 (terminal1 Particularly uplink/ device/base desirable sidelink station) Downlink/1 (terminal plural uplink/ device/base sidelink station) Uplink/ plural(terminal 1 Particularly sidelink device) desirable Uplink/ plural(terminal plural sidelink device)

Control Information Transmitted from Base Station to Terminal Device

Control information transmitted from the base station 100 (for example,the transmission device) to the terminal device 200 (for example, thereception device) when limitations are imposed on the parameters will bedescribed.

The base station 100 (for example, the setting unit 151) sets aparameter selected from settable parameter candidates. The base station100 (the transmission processing unit 153) includes informationindicating the selected parameter in the control information, transmitsthe resulting control information to the terminal device 200, and thentransmits the data signal in accordance with the selected parameter.

An example of the control information when the number of parametercandidates that can be set on the same time resources is limited to 1 isshown in the following Table 16. Hatched parts are the controlinformation related to the parameters on which the limitations areimposed. As illustrated in Table 16, the parameters on which thelimitations are imposed include at least one of the subcarrier interval,the subsymbol time length, the TTI length, and the CP length. Thetransmission of the control information may be omitted when a set valuecorresponds to a predetermined value (for example, a default value or areference value of the system 1). As a result, thetransmission/reception load of the control information is reduced. Here,the default parameter is assumed to be a parameter that is neither aminimum value nor a maximum value that is usable in the system 1.

An example of the control information when the number of parametercandidates that can be set on the same time resources is limited to 2 ormore is shown in the following Table 17. Hatched parts are the controlinformation related to the parameters on which the limitations areimposed. For example, the system 1 can support two or more parametercandidates by preparing the control information related to theparameters on which the limitations are imposed in units of resourceblocks. Although not shown in the same table, the control informationrelated to the parameters may be prepared in units of frequency channels(for example, component carriers) in addition to units of resourceblocks.

A transmission timing of the control information can be variouslyconsidered. For example, the control information may be transmittedconstantly, may be transmitted for each subframe, or may be transmittedeach time the parameter is set (for example, at intervals of schedulingunit times or at intervals of a plurality of scheduling unit times). Theflow of the process in the latter case will be described with referenceto FIGS. 33 and 34.

FIG. 33 is a flowchart illustrating an example of the flow of atransmission process of control information related to downlinkcommunication performed in the base station 100 according to the presentembodiment. As illustrated in FIG. 33, the base station 100 first sets aparameter for one terminal device 200 (step S602). Then, the basestation 100 determines whether or not the set value of the parameter tobe limited corresponds to a predetermined value (for example, a defaultvalue or a reference value of the system 1) (step S604). Here, theparameters to be limited are the parameters hatched in Tables 16 and 17.The default value may be, for example, the subcarrier intervalcorresponding to (0) in Table 13 for the subcarrier interval or may be,for example, the same value (for example, 1 msec) as the subframe forthe TTI. When the set value of the parameter to be limited is determinedto correspond to a predetermined value (YES in step S604), the basestation 100 skips the generation of the control information related tothe parameter to be limited (step S606). On the other hand, when the setvalue of the parameter to be limited is determined to be different froma predetermined value (NO in step S604), the base station 100 generatesthe control information related to the parameter to be limited (stepS608). Then, the base station 100 generates control information relatedto other parameters other than the parameter to be limited (step S610).Then, the base station 100 transmits a group of the generated controlinformation (step S612). Then, the base station 100 performstransmission signal processing such as encoding and modulationcorresponding to the control information group on the real data (stepS614), and transmits the signal subjected to transmission signalprocessing on the physical channel corresponding to the controlinformation group (Step S616). Then, the process ends.

FIG. 34 is a flowchart illustrating an example of the flow of atransmission process of control information related to uplinkcommunication performed in the base station 100 according to the presentembodiment. As illustrated in FIG. 34, the base station 100 first sets aparameter for one terminal device 200 (step S702). Then, the basestation 100 determines whether or not the set value of the parameter tobe limited corresponds to a predetermined value (for example, a defaultvalue or a reference value of the system 1) (step S704). When the setvalue of the parameter to be limited is determined to correspond to apredetermined value (YES in step S704), the base station 100 skips thegeneration of the control information related to the parameter to belimited (step S706). On the other hand, when the set value of theparameter to be limited is determined not to correspond to apredetermined value (NO in step S704), the base station 100 generatesthe control information related to the parameter to be limited (stepS708). Then, the base station 100 generates control information relatedto parameters other than parameter of limitation target (step S710).Then, the base station 100 transmits a group of the generated controlinformation (step S712). Then, the base station 100 receives the signaltransmitted from the terminal device 200 in accordance with the controlinformation group (step S714). Then, the base station 100 performsreception signal processing such as decoding and demodulationcorresponding to the group of control information on the receptionsignal, and acquires data (step S716). Then, the process ends.

Control Information Transmitted from Terminal Device to Base Station

The control information transmitted from the terminal device 200 to thebase station 100 when limitations can be imposed on the parameters willbe described.

For example, this control information is UE capability informationindicating capabilities of the terminal device 200. The UE capabilityinformation includes information about a capability for transmissionsignal processing of the terminal device 200 and a capability forreception signal processing. The base station 100 can perform schedulingand setting and notification of the parameter on the basis of thereceived UE capability information

An example of the UE capability information is shown in the followingTable 18. As shown in Table 18, the UE capability information mayinclude information common to both transmission and reception (forexample, a UE category indicating a category of the terminal device 200)in addition to information related to transmission signal processing andreception signal processing.

TABLE 18 Capability Information Sub Information Elements ElementsFormats Supplement Common UE Category Integer (0, 1, 2, . . . )Capability Support Subcarrier Integer (0, 1, 2, . . . ) InformationSpacing Support Cyclic Integer (0, 1, 2, . . . ) Prefix Length SupportSymbol Integer (0, 1, 2, . . . ) Length Support TTI Integer (0, 1, 2, .. . ) Transmitter Filtering Capability Yes/No Capability WindowingYes/No Information Capability Support Filtering Integer (0, 1, 2, . . .) May be added only Type when Filtering Capability is Yes SupportWindowing Integer (0, 1, 2, . . . ) May be added only Type whenWindowing Capability is Yes Receiver Filtering Capability Yes/NoCapability Windowing Yes/No Information Capability Support FilteringInteger (0, 1, 2, . . . ) May be added only Type when FilteringCapability is Yes Support Windowing Integer (0, 1, 2, . . . ) May beadded only Type when Windowing Capability is Yes Cancellation Yes/NoCapability Support Cancellation Integer (0, 1, 2, . . . ) May be addedonly Type when Windowing Capability is Yes

It is desirable that the UE capability information be received by thebase station 100 before dynamic scheduling of the data channel by thebase station 100. It is desirable that a timing is exchanged during theRRC connection procedure or the handover procedure. The flow of theprocess related to the transmission of the UE capability informationwill be described with reference to FIG. 35 and FIG. 36.

FIG. 35 is a sequence diagram illustrating an example of a flow of atransmission process of the UE capability information related todownlink communication performed in the system 1 according to thepresent embodiment. In this sequence, the base station 100 and theterminal device 200 are involved. As illustrated in FIG. 35, first, thebase station 100 transmits the system information to the terminal device200 via a physical broadcast channel (PBCH) or a physical downlinkshared channel (PDSCH) (step S802). Then, the terminal device 200transmits the UE capability information to the base station 100 via aPhysical Uplink Control Channel (PUCCH) or a physical uplink sharedchannel (PUSCH) (step S804). Then, the base station 100 performsscheduling on the basis of the received UE capability information (stepS806). Through this scheduling, the parameters to be used when thetarget terminal device 200 receives the PDSCH (the subframe, theresource block, the subcarrier interval, the number of subcarriers, theCP length, the TTI, and the like) are set. Then, the base station 100transmits the control information including the parameters correspondingto a scheduling result to the terminal device 200 through a PhysicalDownlink Control Channel (PDCCH) (or an enhanced EPDCCH (EPDCCH)) or thePDSCH (step S808). Then, the base station 100 transmits the data signalto the terminal device 200 through the PDSCH or a physical multicastchannel (PMCH) (step S810). Then, the terminal device 200 performs thereception process of the data signal in accordance with the receivedcontrol information and transmits a response (ACK/NACK) to the basestation 100 through the PUCCH or the PUSCH (step S812). Then, theprocess ends.

FIG. 36 is a sequence diagram illustrating an example of a flow of atransmission process of the UE capability information related to uplinkcommunication performed in the system 1 according to the presentembodiment. In this sequence, the base station 100 and the terminaldevice 200 are involved. As illustrated in FIG. 36, the base station 100first transmits the system information to the terminal device 200through the PBCH or the PDSCH (step S902). Then, the terminal device 200transmits the UE capability information to the base station 100 throughthe PUCCH or the PUSCH (step S904). Then, the base station 100 performsscheduling on the basis of the received UE capability information (stepS906). Through this scheduling, the parameters to be used when thetarget terminal device 200 transmits the PUSCH (the subframe, theresource block, the subcarrier interval, the number of subcarriers, theCP length, the TTI, and the like) are set. Then, the base station 100transmits the control information including the parameters correspondingto a scheduling result to the terminal device 200 through the PDCCH (orthe ePDCCH) or the PDSCH (step S908). Then, the terminal device 200transmits the data signal to the base station 100 through the PUSCH inaccordance with the received control information (step S910). Then, thebase station 100 performs the reception process of the data signal inaccordance with the set parameters and transmits a response (ACK/NACK)to the terminal device 200 through the PDCCH (step S912). Then, theprocess ends.

5. Application Examples

The technology of an embodiment of the present disclosure is applicableto various products. For example, the base station 100 may be realizedas any type of evolved Node B (eNB) such as a macro eNB or a small eNB.A small eNB may be an eNB that covers a cell smaller than a macro cell,such as a pico eNB, micro eNB, or home (femto) eNB. Instead, the basestation 100 may be realized as any other types of base stations such asa NodeB and a base transceiver station (BTS). The base station 100 mayinclude a main body (that is also referred to as a base stationapparatus) configured to control radio communication, and one or moreremote radio heads (RRH) disposed in a different place from the mainbody. Additionally, various types of terminals to be discussed below mayalso operate as the base station 100 by temporarily or semi-permanentlyexecuting a base station function. Furthermore, at least a part ofelements of the base station 100 may be realized in the base stationapparatus or a module for the base station apparatus.

For example, the terminal device 200 may be realized as a mobileterminal such as a smartphone, a tablet personal computer (PC), anotebook PC, a portable game terminal, a portable/dongle type mobilerouter, and a digital camera, or an in-vehicle terminal such as a carnavigation apparatus. The terminal device 200 may also be realized as aterminal (that is also referred to as a machine type communication (MTC)terminal) that performs machine-to-machine (M2M) communication.Furthermore, at least a part of elements of the terminal device 200 maybe realized in a module (such as an integrated circuit module includinga single die) mounted on each of the terminals.

5.1. Application Example Regarding Base Station First ApplicationExample

FIG. 37 is a block diagram illustrating a first example of a schematicconfiguration of an eNB to which the technology of an embodiment of thepresent disclosure may be applied. An eNB 800 includes one or moreantennas 810 and a base station apparatus 820. Each antenna 810 and thebase station apparatus 820 may be connected to each other via an RFcable.

Each of the antennas 810 includes a single or multiple antenna elements(such as multiple antenna elements included in an MIMO antenna), and isused for the base station apparatus 820 to transmit and receive radiosignals. The eNB 800 may include the multiple antennas 810, asillustrated in FIG. 37. For example, the multiple antennas 810 may becompatible with multiple frequency bands used by the eNB 800. AlthoughFIG. 37 illustrates the example in which the eNB 800 includes themultiple antennas 810, the eNB 800 may also include a single antenna810.

The base station apparatus 820 includes a controller 821, a memory 822,a network interface 823, and a radio communication interface 825.

The controller 821 may be, for example, a CPU or a DSP, and operatesvarious functions of a higher layer of the base station apparatus 820.For example, the controller 821 generates a data packet from data insignals processed by the radio communication interface 825, andtransfers the generated packet via the network interface 823. Thecontroller 821 may bundle data from multiple base band processors togenerate the bundled packet, and transfer the generated bundled packet.The controller 821 may have logical functions of performing control suchas radio resource control, radio bearer control, mobility management,admission control, and scheduling. The control may be performed incorporation with an eNB or a core network node in the vicinity. Thememory 822 includes RAM and ROM, and stores a program that is executedby the controller 821, and various types of control data (such as aterminal list, transmission power data, and scheduling data).

The network interface 823 is a communication interface for connectingthe base station apparatus 820 to a core network 824. The controller 821may communicate with a core network node or another eNB via the networkinterface 823. In that case, the eNB 800, and the core network node orthe other eNB may be connected to each other through a logical interface(such as an S1 interface and an X2 interface). The network interface 823may also be a wired communication interface or a radio communicationinterface for radio backhaul. If the network interface 823 is a radiocommunication interface, the network interface 823 may use a higherfrequency band for radio communication than a frequency band used by theradio communication interface 825.

The radio communication interface 825 supports any cellularcommunication scheme such as Long Term Evolution (LTE) and LTE-Advanced,and provides radio connection to a terminal positioned in a cell of theeNB 800 via the antenna 810. The radio communication interface 825 maytypically include, for example, a baseband (BB) processor 826 and an RFcircuit 827. The BB processor 826 may perform, for example,encoding/decoding, modulating/demodulating, andmultiplexing/demultiplexing, and performs various types of signalprocessing of layers (such as L1, medium access control (MAC), radiolink control (RLC), and a packet data convergence protocol (PDCP)). TheBB processor 826 may have a part or all of the above-described logicalfunctions instead of the controller 821. The BB processor 826 may be amemory that stores a communication control program, or a module thatincludes a processor and a related circuit configured to execute theprogram. Updating the program may allow the functions of the BBprocessor 826 to be changed. The module may be a card or a blade that isinserted into a slot of the base station apparatus 820. Alternatively,the module may also be a chip that is mounted on the card or the blade.Meanwhile, the RF circuit 827 may include, for example, a mixer, afilter, and an amplifier, and transmits and receives radio signals viathe antenna 810.

The radio communication interface 825 may include the multiple BBprocessors 826, as illustrated in FIG. 37. For example, the multiple BBprocessors 826 may be compatible with multiple frequency bands used bythe eNB 800. The radio communication interface 825 may include themultiple RF circuits 827, as illustrated in FIG. 37. For example, themultiple RF circuits 827 may be compatible with multiple antennaelements. Although FIG. 37 illustrates the example in which the radiocommunication interface 825 includes the multiple BB processors 826 andthe multiple RF circuits 827, the radio communication interface 825 mayalso include a single BB processor 826 or a single RF circuit 827.

In the eNB 800 illustrated in FIG. 37, one or more components (thesetting unit 151 and/or the transmission processing unit 153) includedin the base station 100 described with reference to FIG. 5 may beimplemented in the radio communication interface 825. Alternatively, atleast some of the components may be implemented in the controller 821.As an example, the eNB 800 may include a module that includes a part(for example, the BB processor 826) or all of the radio communicationinterface 825 and/or the controller 821, and one or more componentsdescribed above may be mounted in the module. In this case, the modulemay store a program causing a processor to function as one or morecomponents described above (in other words, a program causing aprocessor to perform operations of one or more components describedabove) and perform the program. As another example, a program causing aprocessor to function as one or more components described above may beinstalled in the eNB 800 and the radio communication interface 825 (forexample, the BB processor 826) and/or the controller 821 may execute theprogram. As described above, the eNB 800, the base station apparatus820, or the module may be provided as a device including one or morecomponents described above, and a program causing a processor tofunction as one or more components described above may be provided.Further, a readable recording medium having a program recorded thereinmay be provided.

Furthermore, in the eNB 800 illustrated in FIG. 37, the radiocommunication unit 120 described by using FIG. 5 may be implemented bythe radio communication interface 825 (e.g., the RF circuit 827). Inaddition, the antenna unit 110 may be implemented by the antenna 810.Further, the network communication unit 130 may be implemented in thecontroller 821 and/or the network interface 823. Further, the storageunit 140 may be mounted in the memory 822.

Second Application Example

FIG. 38 is a block diagram illustrating a second example of a schematicconfiguration of an eNB to which the technology of an embodiment of thepresent disclosure may be applied. An eNB 830 includes one or moreantennas 840, a base station apparatus 850, and an RRH 860. Each antenna840 and the RRH 860 may be connected to each other via an RF cable. Thebase station apparatus 850 and the RRH 860 may be connected to eachother via a high speed line such as an optical fiber cable.

Each of the antennas 840 includes a single or multiple antenna elements(such as multiple antenna elements included in an MIMO antenna), and isused for the RRH 860 to transmit and receive radio signals. The eNB 830may include the multiple antennas 840, as illustrated in FIG. 38. Forexample, the multiple antennas 840 may be compatible with multiplefrequency bands used by the eNB 830. Although FIG. 38 illustrates theexample in which the eNB 830 includes the multiple antennas 840, the eNB830 may also include a single antenna 840.

The base station apparatus 850 includes a controller 851, a memory 852,a network interface 853, a radio communication interface 855, and aconnection interface 857. The controller 851, the memory 852, and thenetwork interface 853 are the same as the controller 821, the memory822, and the network interface 823 described with reference to FIG. 37.

The radio communication interface 855 supports any cellularcommunication scheme such as LTE and LTE-Advanced, and provides radiocommunication to a terminal positioned in a sector corresponding to theRRH 860 via the RRH 860 and the antenna 840. The radio communicationinterface 855 may typically include, for example, a BB processor 856.The BB processor 856 is the same as the BB processor 826 described withreference to FIG. 37, except the BB processor 856 is connected to the RFcircuit 864 of the RRH 860 via the connection interface 857. The radiocommunication interface 855 may include the multiple BB processors 856,as illustrated in FIG. 38. For example, the multiple BB processors 856may be compatible with multiple frequency bands used by the eNB 830.Although FIG. 38 illustrates the example in which the radiocommunication interface 855 includes the multiple BB processors 856, theradio communication interface 855 may also include a single BB processor856.

The connection interface 857 is an interface for connecting the basestation apparatus 850 (radio communication interface 855) to the RRH860. The connection interface 857 may also be a communication module forcommunication in the above-described high speed line that connects thebase station apparatus 850 (radio communication interface 855) to theRRH 860.

The RRH 860 includes a connection interface 861 and a radiocommunication interface 863.

The connection interface 861 is an interface for connecting the RRH 860(radio communication interface 863) to the base station apparatus 850.The connection interface 861 may also be a communication module forcommunication in the above-described high speed line.

The radio communication interface 863 transmits and receives radiosignals via the antenna 840. The radio communication interface 863 maytypically include, for example, the RF circuit 864. The RF circuit 864may include, for example, a mixer, a filter, and an amplifier, andtransmits and receives radio signals via the antenna 840. The radiocommunication interface 863 may include multiple RF circuits 864, asillustrated in FIG. 38. For example, the multiple RF circuits 864 maysupport multiple antenna elements. Although FIG. 38 illustrates theexample in which the radio communication interface 863 includes themultiple RF circuits 864, the radio communication interface 863 may alsoinclude a single RF circuit 864.

In the eNB 830 illustrated in FIG. 38, one or more components (thesetting unit 151 and/or the transmission processing unit 153) includedin the base station 100 described with reference to FIG. 5 may beimplemented in the radio communication interface 855 and/or the radiocommunication interface 863. Alternatively, at least some of thecomponents may be implemented in the controller 851. As an example, theeNB 830 may include a module that includes a part (for example, the BBprocessor 856) or all of the radio communication interface 855 and/orthe controller 851, and one or more components described above may bemounted in the module. In this case, the module may store a programcausing a processor to function as one or more components describedabove (in other words, a program causing a processor to performoperations of one or more components described above) and perform theprogram. As another example, a program causing a processor to functionas one or more components described above may be installed in the eNB830 and the radio communication interface 855 (for example, the BBprocessor 856) and/or the controller 851 may execute the program. Asdescribed above, the eNB 830, the base station apparatus 850, or themodule may be provided as a device including one or more componentsdescribed above, and a program causing a processor to function as one ormore components described above may be provided. Further, a readablerecording medium having a program recorded therein may be provided.

Furthermore, for example, in the eNB 830 illustrated in FIG. 38, theradio communication unit 120 described by using FIG. 5 may beimplemented by the radio communication interface 863 (e.g., the RFcircuit 864). In addition, the antenna unit 110 may be implemented bythe antenna 840. Further, the network communication unit 130 may beimplemented in the controller 851 and/or the network interface 853.Further, the storage unit 140 may be mounted in the memory 852.

5.2. Application Example Regarding Terminal Device First ApplicationExample

FIG. 39 is a block diagram illustrating an example of a schematicconfiguration of a smartphone 900 to which the technology of anembodiment of the present disclosure may be applied. The smartphone 900includes a processor 901, a memory 902, a storage 903, an externalconnection interface 904, a camera 906, a sensor 907, a microphone 908,an input device 909, a display device 910, a speaker 911, a radiocommunication interface 912, one or more antenna switches 915, one ormore antennas 916, a bus 917, a battery 918, and an auxiliary controller919.

The processor 901 may be, for example, a CPU or a system on a chip(SoC), and controls functions of an application layer and another layerof the smartphone 900. The memory 902 includes RAM and ROM, and stores aprogram that is executed by the processor 901, and data. The storage 903may include a storage medium such as a semiconductor memory and a harddisk. The external connection interface 904 is an interface forconnecting an external device such as a memory card and a universalserial bus (USB) device to the smartphone 900.

The camera 906 includes an image sensor such as a charge coupled device(CCD) and a complementary metal oxide semiconductor (CMOS), andgenerates a captured image. The sensor 907 may include a group ofsensors such as a measurement sensor, a gyro sensor, a geomagneticsensor, and an acceleration sensor. The microphone 908 converts soundsthat are input to the smartphone 900 to audio signals. The input device909 includes, for example, a touch sensor configured to detect touchonto a screen of the display device 910, a keypad, a keyboard, a button,or a switch, and receives an operation or an information input from auser. The display device 910 includes a screen such as a liquid crystaldisplay (LCD) and an organic light-emitting diode (OLED) display, anddisplays an output image of the smartphone 900. The speaker 911 convertsaudio signals that are output from the smartphone 900 to sounds.

The radio communication interface 912 supports any cellularcommunication scheme such as LTE and LTE-Advanced, and performs radiocommunication. The radio communication interface 912 may typicallyinclude, for example, a BB processor 913 and an RF circuit 914. The BBprocessor 913 may perform, for example, encoding/decoding,modulating/demodulating, and multiplexing/demultiplexing, and performsvarious types of signal processing for radio communication. Meanwhile,the RF circuit 914 may include, for example, a mixer, a filter, and anamplifier, and transmits and receives radio signals via the antenna 916.The radio communication interface 912 may also be a one chip module thathas the BB processor 913 and the RF circuit 914 integrated thereon. Theradio communication interface 912 may include the multiple BB processors913 and the multiple RF circuits 914, as illustrated in FIG. 39.Although FIG. 39 illustrates the example in which the radiocommunication interface 912 includes the multiple BB processors 913 andthe multiple RF circuits 914, the radio communication interface 912 mayalso include a single BB processor 913 or a single RF circuit 914.

Furthermore, in addition to a cellular communication scheme, the radiocommunication interface 912 may support another type of radiocommunication scheme such as a short-distance wireless communicationscheme, a near field communication scheme, and a radio local areanetwork (LAN) scheme. In that case, the radio communication interface912 may include the BB processor 913 and the RF circuit 914 for eachradio communication scheme.

Each of the antenna switches 915 switches connection destinations of theantennas 916 among multiple circuits (such as circuits for differentradio communication schemes) included in the radio communicationinterface 912.

Each of the antennas 916 includes a single or multiple antenna elements(such as multiple antenna elements included in an MIMO antenna), and isused for the radio communication interface 912 to transmit and receiveradio signals. The smartphone 900 may include the multiple antennas 916,as illustrated in FIG. 39. Although FIG. 39 illustrates the example inwhich the smartphone 900 includes the multiple antennas 916, thesmartphone 900 may also include a single antenna 916.

Furthermore, the smartphone 900 may include the antenna 916 for eachradio communication scheme. In that case, the antenna switches 915 maybe omitted from the configuration of the smartphone 900.

The bus 917 connects the processor 901, the memory 902, the storage 903,the external connection interface 904, the camera 906, the sensor 907,the microphone 908, the input device 909, the display device 910, thespeaker 911, the radio communication interface 912, and the auxiliarycontroller 919 to each other. The battery 918 supplies power to blocksof the smartphone 900 illustrated in FIG. 39 via feeder lines, which arepartially shown as dashed lines in the figure. The auxiliary controller919 operates a minimum necessary function of the smartphone 900, forexample, in a sleep mode.

In the smartphone 900 illustrated in FIG. 39, one or more components(reception processing unit 241) included in the terminal device 200described with reference to FIG. 6 may be implemented in the radiocommunication interface 912. Alternatively, at least some of thecomponents may be implemented in the processor 901 or the auxiliarycontroller 919. As an example, the smartphone 900 may include a modulethat includes a part (for example, the BB processor 913) or all of theradio communication interface 912, the processor 901 and/or theauxiliary controller 919, and one or more components described above maybe mounted in the module. In this case, the module may store a programcausing a processor to function as one or more components describedabove (in other words, a program causing a processor to performoperations of one or more components described above) and perform theprogram. As another example, a program causing a processor to functionas one or more components described above may be installed in thesmartphone 900 and the radio communication interface 912 (for example,the BB processor 913), the processor 901 and/or the auxiliary controller919 may execute the program. As described above, the smartphone 900, thebase station apparatus 820, or the module may be provided as a deviceincluding one or more components described above, and a program causinga processor to function as one or more components described above may beprovided. Further, a readable recording medium having a program recordedtherein may be provided.

Furthermore, for example, in the smartphone 900 illustrated in FIG. 39,the radio communication unit 220 described by using FIG. 6 may beimplemented by the radio communication interface 912 (e.g., the RFcircuit 914). In addition, the antenna unit 210 may be implemented bythe antenna 916. Further, the storage unit 230 may be mounted in thememory 902.

Second Application Example

FIG. 40 is a block diagram illustrating an example of a schematicconfiguration of a car navigation apparatus 920 to which the technologyof an embodiment of the present disclosure may be applied. The carnavigation apparatus 920 includes a processor 921, a memory 922, aglobal positioning system (GPS) module 924, a sensor 925, a datainterface 926, a content player 927, a storage medium interface 928, aninput device 929, a display device 930, a speaker 931, a radiocommunication interface 933, one or more antenna switches 936, one ormore antennas 937, and a battery 938.

The processor 921 may be, for example, a CPU or a SoC, and controls anavigation function and another function of the car navigation apparatus920. The memory 922 includes RAM and ROM, and stores a program that isexecuted by the processor 921, and data.

The GPS module 924 uses GPS signals received from a GPS satellite tomeasure a position (such as latitude, longitude, and altitude) of thecar navigation apparatus 920. The sensor 925 may include a group ofsensors such as a gyro sensor, a geomagnetic sensor, and a sensor. Thedata interface 926 is connected to, for example, an in-vehicle network941 via a terminal that is not shown, and acquires data generated by thevehicle, such as vehicle speed data.

The content player 927 reproduces content stored in a storage medium(such as a CD and a DVD) that is inserted into the storage mediuminterface 928. The input device 929 includes, for example, a touchsensor configured to detect touch onto a screen of the display device930, a button, or a switch, and receives an operation or an informationinput from a user. The display device 930 includes a screen such as aLCD or an OLED display, and displays an image of the navigation functionor content that is reproduced. The speaker 931 outputs sounds of thenavigation function or the content that is reproduced.

The radio communication interface 933 supports any cellularcommunication scheme such as LET and LTE-Advanced, and performs radiocommunication. The radio communication interface 933 may typicallyinclude, for example, a BB processor 934 and an RF circuit 935. The BBprocessor 934 may perform, for example, encoding/decoding,modulating/demodulating, and multiplexing/demultiplexing, and performsvarious types of signal processing for radio communication. Meanwhile,the RF circuit 935 may include, for example, a mixer, a filter, and anamplifier, and transmits and receives radio signals via the antenna 937.The radio communication interface 933 may be a one chip module havingthe BB processor 934 and the RF circuit 935 integrated thereon. Theradio communication interface 933 may include the multiple BB processors934 and the multiple RF circuits 935, as illustrated in FIG. 40.Although FIG. 40 illustrates the example in which the radiocommunication interface 933 includes the multiple BB processors 934 andthe multiple RF circuits 935, the radio communication interface 933 mayalso include a single BB processor 934 or a single RF circuit 935.

Furthermore, in addition to a cellular communication scheme, the radiocommunication interface 933 may support another type of radiocommunication scheme such as a short-distance wireless communicationscheme, a near field communication scheme, and a radio LAN scheme. Inthat case, the radio communication interface 933 may include the BBprocessor 934 and the RF circuit 935 for each radio communicationscheme.

Each of the antenna switches 936 switches connection destinations of theantennas 937 among multiple circuits (such as circuits for differentradio communication schemes) included in the radio communicationinterface 933.

Each of the antennas 937 includes a single or multiple antenna elements(such as multiple antenna elements included in an MIMO antenna), and isused for the radio communication interface 933 to transmit and receiveradio signals. The car navigation apparatus 920 may include the multipleantennas 937, as illustrated in FIG. 40. Although FIG. 40 illustratesthe example in which the car navigation apparatus 920 includes themultiple antennas 937, the car navigation apparatus 920 may also includea single antenna 937.

Furthermore, the car navigation apparatus 920 may include the antenna937 for each radio communication scheme. In that case, the antennaswitches 936 may be omitted from the configuration of the car navigationapparatus 920.

The battery 938 supplies power to blocks of the car navigation apparatus920 illustrated in FIG. 40 via feeder lines that are partially shown asdashed lines in the figure. The battery 938 accumulates power suppliedfrom the vehicle.

In the car navigation apparatus 920 illustrated in FIG. 40, one or morecomponents (reception processing unit 241) included in the terminaldevice 200 described with reference to FIG. 6 may be implemented in theradio communication interface 933. Alternatively, at least some of thecomponents may be implemented in the processor 921. As an example, thecar navigation apparatus 920 may include a module that includes a part(for example, the BB processor 934) or all of the radio communicationinterface 933, and/or the processor 921, and one or more componentsdescribed above may be mounted in the module. In this case, the modulemay store a program causing a processor to function as one or morecomponents described above (in other words, a program causing aprocessor to perform operations of one or more components describedabove) and perform the program. As another example, a program causing aprocessor to function as one or more components described above may beinstalled in the car navigation apparatus 920 and the radiocommunication interface 933 (for example, the BB processor 934), and/orthe processor 921 may execute the program. As described above, the carnavigation apparatus 920, the base station apparatus 820, or the modulemay be provided as a device including one or more components describedabove, and a program causing a processor to function as one or morecomponents described above may be provided. Further, a readablerecording medium having a program recorded therein may be provided.

Furthermore, for example, in the car navigation apparatus 920illustrated in FIG. 40, the radio communication unit 220 described byusing FIG. 6 may be implemented by the radio communication interface 933(e.g., the RF circuit 935). In addition, the antenna unit 210 may beimplemented by the antenna 937. Further, the storage unit 230 may bemounted in the memory 922.

The technology of an embodiment of the present disclosure may also berealized as an in-vehicle system (or a vehicle) 940 including one ormore blocks of the car navigation apparatus 920, the in-vehicle network941, and a vehicle module 942. That is, the in-vehicle system (or avehicle) 940 may be provided as an apparatus including the receptionprocessing unit 241. The vehicle module 942 generates vehicle data suchas vehicle speed, engine speed, and trouble information, and outputs thegenerated data to the in-vehicle network 941.

6. Conclusion

The exemplary embodiments of the present disclosure have been describedin detail with reference to FIGS. 1 to 40. As described above, thetransmission device according to the present embodiment variably sets atleast one of the intervals of the subcarriers and the time lengths ofthe subsymbols included in the unit resources configured with one ormore subcarriers or one or more subsymbols and performs filtering foreach subcarrier. In other words, the transmission device according tothe present embodiment can variably set at least one of the subcarrierinterval and the subsymbol time length in the network supporting GFDM.Therefore, when introducing GFDM, the system 1 can accommodate thelegacy terminals not supporting GFDM in addition to the terminalssupporting GFDM.

The preferred embodiment(s) of the present disclosure has/have beendescribed above with reference to the accompanying drawings, whilst thepresent disclosure is not limited to the above examples. A personskilled in the art may find various alterations and modifications withinthe scope of the appended claims, and it should be understood that theywill naturally come under the technical scope of the present disclosure.

Further, in this specification, the processes described with referenceto the flowcharts and the sequence diagrams need not be necessarilyperformed in the illustrated order. Some process steps may be performedin parallel. Further, additional process steps may be employed, or someprocess steps may be omitted.

Further, the effects described in this specification are merelyillustrative or exemplified effects, and are not limitative. That is,with or in the place of the above effects, the technology according tothe present disclosure may achieve other effects that are clear to thoseskilled in the art from the description of this specification.

Additionally, the present technology may also be configured as below.

(1)

A device, including:

a setting unit configured to variably set at least one of an intervalbetween subcarriers and a time length of a subsymbol included in a unitresource constituted by one or more subcarriers or one or moresubsymbols; and

a transmission processing unit configured to perform filtering for everypredetermined number of subcarriers.

(2)

The device according to (1),

wherein the transmission processing unit performs the filtering on thebasis of a setting configured by the setting unit.

(3)

The device according to (2),

wherein the transmission processing unit variably sets a bandwidth of afilter on the basis of the set interval between the subcarriers.

(4)

The device according to (2) or (3),

wherein the transmission processing unit applies a filter in which afilter coefficient with a sharp band limitation characteristic is set toa subcarrier having a small interval, and applies a filter in which afilter coefficient with a gentle band limitation characteristic is setto a subcarrier having a large interval.

(5)

The device according to (4),

wherein the filter coefficient with the sharp band limitationcharacteristic is a filter coefficient corresponding to a raised-cosinefilter, and the filter coefficient with the gentle band limitationcharacteristic is a filter coefficient corresponding to aroot-raised-cosine filter.

(6)

The device according to (4) or (5),

wherein the filter coefficient with the sharp band limitationcharacteristic has a small roll-off factor, and the filter coefficientwith the gentle band limitation characteristic has a large roll-offfactor.

(7)

The device according to any one of (2) to (6),

wherein the transmission processing unit applies a filter according toan interference cancellation capability of a reception device serving asa transmission target.

(8)

The device according to any one of (1) to (7),

wherein the setting unit sets the intervals between the subcarriers andthe time lengths of the subsymbols to be the same within the unitresources.

(9)

The device according to any one of (1) to (8),

wherein the transmission processing unit adds a cyclic prefix of a sametime length to one or more of the unit resources serving as additiontargets.

(10)

The device according to any one of (1) to (9),

wherein values of products of the number of subcarriers and the numberof subsymbols are the same in the unit resources that are different fromeach other.

(11)

The device according to any one of (1) to (10),

wherein the setting unit sets an integer multiple of a minimum settablevalue as the time length of the subsymbol.

(12)

The device according to any one of (1) to (11),

wherein the setting unit sets a value by which a time length of the unitresource is divisible as the time length of the subsymbol.

(13)

The device according to any one of (1) to (12),

wherein the setting unit sets an integer multiple of a minimum settablevalue as the interval between the subcarriers.

(14)

The device according to any one of (1) to (13),

wherein the setting unit sets a value by which a bandwidth of the unitresources is divisible as the interval between the subcarriers.

(15)

The device according to any one of (1) to (14),

wherein the transmission processing unit performs over-sampling for eachsubcarrier at a stage prior to the filtering.

(16)

The device according to (15),

wherein the transmission processing unit performs frequency conversionon a signal of a time domain of a processing target at a stage prior tothe over-sampling.

(17)

The device according to any one of (1) to (16),

wherein the setting unit sets at least one of the number of subcarriersand the number of subsymbols to be odd.

(18)

The device according to any one of (1) to (17),

wherein the predetermined number is 1.

(19)

The device according to any one of (1) to (18),

wherein the predetermined number is the number of subcarriers includedin the unit resource.

(20)

The device according to at least any one of (1) to (20),

wherein the setting unit sets at least one of the interval between thesubcarriers and the time length of the subsymbol in accordance with amoving speed of a reception device.

(21)

The device according to (1),

wherein the setting unit limits the number of parameter candidatessettable by a terminal device in a plurality of the unit resources on asame time resource to a predetermined number.

(22)

The device according to (21),

wherein the plurality of unit resources are included in one frequencychannel.

(23)

The device according to (21),

wherein the plurality of unit resources are included in a plurality offrequency channels.

(24)

The device according to any one of (21) to (23),

wherein the number of parameter candidates is limited to thepredetermined number in a plurality of frequency channels, and thenumber of parameter candidates is limited to the predetermined numberminus one in one frequency channel.

(25)

The device according to any one of (21) to (23),

wherein the predetermined number is one.

(26)

The device according to any one of (21) to (25),

wherein information indicating a set parameter is included in controlinformation and reported to the terminal device.

(27)

The device according to (26),

wherein the information indicating the set parameter is included in thecontrol information and reported to the terminal device when the setparameter is different from a default parameter.

(28)

The device according to (27),

wherein the default parameter is a parameter that is neither a minimumpossible value nor a maximum possible value.

(29)

The device according to any one of (26) to (28),

wherein the control information is transmitted for each subframe.

(30)

The device according to any one of (26) to (28),

wherein the control information is transmitted at one or more schedulingunit times.

(31)

The device according to any one of (26) to (30),

wherein the parameter includes at least one of the interval between thesubcarriers, the time length of the subsymbol, a TTI length, and a CPlength.

(32)

The device according to any one of (21) to (31),

wherein the terminal device transmits information indicating acapability to a base station.

(33)

A device, including:

a setting unit configured to set a non-use frequency domain in a unitresource constituted by one or more subcarriers or one or moresubsymbols and variably set at least one of an interval between thesubcarriers or a time length of the subsymbol in use frequency domainsother than the non-use frequency domain.

(34)

The device according to (33),

wherein the setting unit variably sets at least one of the intervalbetween the subcarriers or the time length of the subsymbol included inthe unit resource, and switches whether or not to set the non-usefrequency domain in accordance with whether or not the intervals betweenthe subcarriers or the time lengths of subsymbols in a plurality of theunit resources on a same time resource are the same.

(35)

The device according to (34),

wherein the setting unit variably sets at least one of the intervalbetween the subcarriers or the time length of the subsymbol included inthe unit resource, and sets the non-use frequency domain when theintervals between the subcarriers or the time lengths of the subsymbolsin the plurality of unit resources on the same time resource aredifferent.

(36)

The device according to (34) or (35),

wherein the plurality of unit resources are included in one frequencychannel.

(37)

The device according to (34) or (35),

wherein the plurality of unit resources are included in a plurality offrequency channels.

(38)

The device according to any one of (34) to (34),

wherein respective bandwidths of the plurality of unit resources are thesame on a same time resource.

(39)

The device according to any one of (33) to (38),

wherein the unit resource is a resource block.

(40)

The device according to any one of (33) to (39),

wherein the setting unit sets an interval between subcarriers includedin the unit resource in which the non-use domain is set to be equal toor less than an interval between subcarriers included in the unitresource in which the non-use domain is not set.

(41)

The device according to (33) to (40),

wherein the setting unit sets the number of subcarriers included in theunit resource in which the non-use domain is set to be equal to or lessthan the number of subcarriers included in the unit resource in whichthe non-use domain is not set.

(42)

The device according to any one of (33) to (41),

wherein when the number of subcarriers included in the unit resource inwhich the non-use domain is set is odd, the setting unit sets a centerfrequency of at least one of the subcarriers included in the unitresource to be identical or substantially identical to a centerfrequency of the unit resource.

(43)

The device according to any one of (33) to (42),

wherein when the number of subcarriers included in the unit resource inwhich the non-use domain is set is even, the setting unit sets a centerfrequency of none of the subcarriers included in the unit resource isidentical or substantially identical to a center frequency of the unitresource.

(44)

The device according to any one of (33) to (43),

wherein the setting unit sets the non-use frequency domain at both endsof the unit resource in a frequency direction.

(45)

The device according to any one of (33) to (44),

wherein the setting unit sets bandwidths of two non-use frequencydomains set at both ends of the unit resource in a frequency directionto be the same.

(46)

The device according to any one of (33) to (45), further including, atransmission processing unit configured to include informationindicating content of a setting configured by the setting unit incontrol information and transmit the control information.

(47)

A method, including:

variably setting at least one of an interval between subcarriers and atime length of a subsymbol included in a unit resource constituted byone or more subcarriers or one or more subsymbols; and

performing, by a processor, filtering for every predetermined number ofsubcarriers.

(48)

A program causing a computer to function as:

a setting unit configured to variably set at least one of an intervalbetween subcarriers and a time length of a subsymbol included in a unitresource constituted by one or more subcarriers or one or moresubsymbols; and

a transmission processing unit configured to perform filtering for everypredetermined number of subcarriers.

REFERENCE SIGNS LIST

-   1 system 1-   100 base station-   110 antenna unit-   120 radio communication unit-   130 network communication unit-   140 storage unit-   150 processing unit-   151 setting unit-   153 transmission processing unit-   200 terminal device-   210 antenna unit-   220 radio communication unit-   230 storage unit-   240 processing unit-   241 reception processing unit

1. A device, comprising: a setting unit configured to variably set atleast one of an interval between subcarriers and a time length of asubsymbol included in a unit resource constituted by one or moresubcarriers or one or more subsymbols; and a transmission processingunit configured to perform filtering for every predetermined number ofsubcarriers.
 2. The device according to claim 1, wherein thetransmission processing unit performs the filtering on the basis of asetting configured by the setting unit.
 3. The device according to claim2, wherein the transmission processing unit variably sets a bandwidth ofa filter on the basis of the set interval between the subcarriers. 4.The device according to claim 2, wherein the transmission processingunit applies a filter in which a filter coefficient with a sharp bandlimitation characteristic is set to a subcarrier having a smallinterval, and applies a filter in which a filter coefficient with agentle band limitation characteristic is set to a subcarrier having alarge interval. 5-7. (canceled)
 8. The device according to claim 1,wherein the setting unit sets the intervals between the subcarriers andthe time lengths of the subsymbols to be the same within the unitresources.
 9. The device according to claim 1, wherein the transmissionprocessing unit adds a cyclic prefix of a same time length to one ormore of the unit resources serving as addition targets.
 10. The deviceaccording to claim 1, wherein values of products of the number ofsubcarriers and the number of subsymbols are the same in the unitresources that are different from each other.
 11. The device accordingto claim 1, wherein the setting unit sets an integer multiple of aminimum settable value as the time length of the subsymbol.
 12. Thedevice according to claim 1, wherein the setting unit sets a value bywhich a time length of the unit resource is divisible as the time lengthof the subsymbol.
 13. The device according to claim 1, wherein thesetting unit sets an integer multiple of a minimum settable value as theinterval between the subcarriers.
 14. The device according to claim 1,wherein the setting unit sets a value by which a bandwidth of the unitresources is divisible as the interval between the subcarriers. 15.(canceled)
 16. (canceled)
 17. The device according to claim 1, whereinthe setting unit sets at least one of the number of subcarriers and thenumber of subsymbols to be odd.
 18. (canceled)
 19. The device accordingto claim 1, wherein the predetermined number is the number ofsubcarriers included in the unit resource.
 20. The device according toclaim 1, wherein the setting unit sets at least one of the intervalbetween the subcarriers and the time length of the subsymbol inaccordance with a moving speed of a reception device.
 21. The deviceaccording to claim 1, wherein the setting unit limits the number ofparameter candidates settable by a terminal device in a plurality of theunit resources on a same time resource to a predetermined number. 22.The device according to claim 21, wherein the plurality of unitresources are included in one frequency channel.
 23. The deviceaccording to claim 21, wherein the plurality of unit resources areincluded in a plurality of frequency channels.
 24. The device accordingto claim 21, wherein the number of parameter candidates is limited tothe predetermined number in a plurality of frequency channels, and thenumber of parameter candidates is limited to the predetermined numberminus one in one frequency channel.
 25. (canceled)
 26. The deviceaccording to claim 21, wherein information indicating a set parameter isincluded in control information and reported to the terminal device. 27.The device according to claim 26, wherein the information indicating theset parameter is included in the control information and reported to theterminal device when the set parameter is different from a defaultparameter.
 28. The device according to claim 27, wherein the defaultparameter is a parameter that is neither a minimum possible value nor amaximum possible value.
 29. (canceled)
 30. (canceled)
 31. The deviceaccording to claim 26, wherein the parameter includes at least one ofthe interval between the subcarriers, the time length of the subsymbol,a TTI length, and a CP length.
 32. The device according to claim 21,wherein the terminal device transmits information indicating acapability to a base station.
 33. A device, comprising: a setting unitconfigured to set a non-use frequency domain in a unit resourceconstituted by one or more subcarriers or one or more subsymbols andvariably set at least one of an interval between the subcarriers or atime length of the subsymbol in use frequency domains other than thenon-use frequency domain.
 34. The device according to claim 33, whereinthe setting unit variably sets at least one of the interval between thesubcarriers or the time length of the subsymbol included in the unitresource, and switches whether or not to set the non-use frequencydomain in accordance with whether or not the intervals between thesubcarriers or the time lengths of subsymbols in a plurality of the unitresources on a same time resource are the same.
 35. The device accordingto claim 34, wherein the setting unit sets the non-use frequency domainwhen the intervals between the subcarriers or the time lengths of thesubsymbols in the plurality of unit resources on the same time resourceare different.
 36. (canceled)
 37. (canceled)
 38. The device according toclaim 34, wherein respective bandwidths of the plurality of unitresources are the same on a same time resource.
 39. (canceled)
 40. Thedevice according to claim 33, wherein the setting unit sets an intervalbetween subcarriers included in the unit resource in which the non-usedomain is set to be equal to or less than an interval betweensubcarriers included in the unit resource in which the non-use domain isnot set.
 41. The device according to claim 33, wherein the setting unitsets the number of subcarriers included in the unit resource in whichthe non-use domain is set to be equal to or less than the number ofsubcarriers included in the unit resource in which the non-use domain isnot set.
 42. The device according to claim 33, wherein when the numberof subcarriers included in the unit resource in which the non-use domainis set is odd, the setting unit sets a center frequency of at least oneof the subcarriers included in the unit resource to be identical orsubstantially identical to a center frequency of the unit resource. 43.The device according to claim 33, wherein when the number of subcarriersincluded in the unit resource in which the non-use domain is set iseven, the setting unit sets a center frequency of none of thesubcarriers included in the unit resource is identical or substantiallyidentical to a center frequency of the unit resource.
 44. The deviceaccording to claim 33, wherein the setting unit sets the non-usefrequency domain at both ends of the unit resource in a frequencydirection.
 45. (canceled)
 46. (canceled)
 47. A method, comprising:variably setting at least one of an interval between subcarriers and atime length of a subsymbol included in a unit resource constituted byone or more subcarriers or one or more subsymbols; and performing, by aprocessor, filtering for every predetermined number of subcarriers. 48.(canceled)